90 # 2 = 45 boxes
90 # 5 = 18 boxes
A: If one out of every five boxes goes to Bahrain, it will be two boxes. Because 90 is divisible by 5.
At 2: 57, every three balls in the sporting goods store are packed in a box. Can it be Bahrain?
57 # 3+ 19 A: just finished loading.
3: Two people, A and B, type a document of 10000 words, 1 15 words per minute. If B reaches 135 words per minute, can it be finished in a few minutes?
10000#( 1 15 + 135)= 40
A: It will be completed in 40 minutes.
4. Tree planting. In a group of primary school students with 13 or 14, should they at least take part in tree planting after just counting the fifth grade students?
A13x14 = 192: At least192 people participated in tree planting in the fifth grade.
The following questions are applied problems, and I am the equation of the solution of the system of equations.
5: Two cars take opposite routes from one place. 3 1 km/h, one car, 44 km/h 300 kilometers, how many minutes after two cars?
The formula after the encounter is as follows:
Solution: when two cars x
3 1X +44 X = 300
75X = 300
X = 4 4 hours = 240 minutes
A: After 240 minutes, the two cars are 300 kilometers apart.
6. Two engineering teams need to cooperate to excavate a tunnel with a length of119m. Team Two and Team One dig 4 meters every day, while Team B digs 3 meters. How many days does it take for the latter two to dig a tunnel?
Solution: let x days pass through the excavation tunnel.
3X +4 X = 1 19
7X = 1 19
X = 17
Answer:/kloc-After 0/7 days, the tunnel will be excavated.
The school has a choir and a dance team 140 people. The number of chorus is six. Is there anyone on the dance team and the dance team?
Solution: Set the dance team "X-Men"
6X + X = 140
7X = 140
X = 20
A: A dance team of 20 people.
The title of the ratio equation starts here.
8. The two brothers go to the gym to exercise from home, the distance is 1300m. My brother walks 80 meters per minute, and my brother rides a bicycle. On the way, he immediately returns to the gym and meets my brother at a speed of 180 meters per minute. My brother was gone for a few minutes.
1300X2 =2600 meters 2600
( 180 +80)= 2600#260
= 10
A: At this time, my brother is 10 minutes away.
At 9: 6 1 on children's day, Wang Mai bought 360 biscuits, 480 pieces of 400 fruits and sweets, made exquisite small bags and made some small packages for children as gifts?
360 +480 +400 = 1240 answer: 1240 small package.
10: Naughty bought 40 balloons, and classmates came to our house to blow them. More important than blowing balloons? If you don't participate in mischief, let several students be invited by balloons on an equal footing.
40#2 = 20 40#40#5 = 8 4 = 10
,40#,40#8 = 5 @ 0 = 40#20 = 2
A: The required students are: 20, 10, 5, 8, 4, 2.
1 1: a trapezoid corn,15m, 24m,18m high. There are 9 corn seeds per square meter on average. What is the number of corn per plant on the land?
(15+24) x18 # 2 = 351m2,
35 1X9 = 3 195 strain
A: Land Corn 3 159
12: Some students are less than 100, and there is only one more person in rows 5, 4 and 3. How many people are there in this group?
5X4X3 = 60 60 + 1 = 6 1
A: There are 6 1 person in this group.
13: Wang Yue, a box of chocolates. Every July 5th and 3rd, I have a box of chocolate truffles. How many?
7X5X3 = 105 capsule 105+1 = 106.
A: There are at least 106 boxes of truffle chocolate. .
14: A rectangular corridor with a length of15m and a width of1.2m in the central area of Chen Guang is paved with cubes with a side length of 30cm. Do your math problem: How many cubes do you need? What if each square brick then uses this corridor element?
15m = 150 decimeter 1.2 M = 12 decimeter 30cm = 3 decimeter.
150x12 =1800 square decimeter square decimeter 3X3 = 9.
1800 # = 200 yuan 200X3 = 600 yuan.
A: We need 200 bricks like this. We need 600 yuan.
15: Two parallelogram experimental fields with the same area, with a base length of 70m and a height of 45m, and other bases with a length of 90m. What's your height?
70x 45 = 3 150 m2 3 150 # 90 = 35m。
A: It's 35 meters high.
16: A group of steel pipes are piled in a pile, and the lowest 10 yuan is placed on the first floor, with one less and five on the top floor. The root of those steel pipes?
Layer10-5+1= 6 (10+5) x6 # 2.
= 15X6#2
= 90#2
This is a tube.
-Yes-
1。 Gaodong Village plans to store 720 tons of water to build a rectangular reservoir. It is known that the length of the pool is 18m, the width is over 8m, and the depth is at least several meters. (1 m3 water weight 1 ton). (Equation solving)
A rectangular swimming pool is 50 meters long and 25 meters wide. Original depth of tank1.2m. If the pump drains water, it will drain 2.5 cubic meters per minute. How many hours will it take?
3。 A cuboid gasoline tank, with a bottom area of 16 square decimeter, high decimeter, 0.74 kg, and a liter of gasoline of several kilograms, can you hold it?
4。 2 100 cube with a side length of 1 cm and a stacking height of 1 decimeter is longer and wider than the rectangular cube with a height. What are its length and width in centimeters?
The first question:
Solution: at least x meters deep.
18 * 8X = 720
144X = 720
X = a 5。
At least 5 meters deep.
The second question:
50 * 25 * 1.2 = 1500 (m3)
1500 to 1525 = 600 (minutes)
600 minutes
10 time: 10 hour.
The third question:
16 * 6 =96 cubic meters and 96 liters.
96 * 0.74 = 71.04kg.
Answer: 7 1.04kg drum can be installed.
The fourth question:
1 decimeter =10cm
Two thousandths = 2 10 (cm)
The 70th 2 10= 3 (cm) or 2 10/30 = 70 (cm).
It is 70 cm long, 3 cm wide, 30 cm long and 7 cm wide.
Question 5:
A cube with a side length of 2 cm and a surface area?
Answer: 2 * 2 * 6 = 24 (square centimeter)
Question 6:
Cuboid, length 2 cm, width 2 cm, 1 cm, surface area?
Answer: (2 * 2+2 *1+2 *1) * 2 =16 (square centimeter).
Question 7: Rectangular solid wood is 2m long, 5m wide and 8m thick. What is its surface area? Volume cubic meter?
Answer: Area: (2 * 5+2 * 8+5 * 8)* 2 = 132 (square meter).
Quantity: 2 * 5 * 8 = 80 (m)
& gt
8: The drum side of the cube is 0.8m long. How many liters is its volume? How many square decimetres of iron do you cut to make drums?
0.8 * 0.8 * 0.8 = 0.5 12 (square meter) = 5 12 (length)
0.8 * 0.8 * 6 = 3.084 (square meter) = 348 (square decimeter)
Three sticks are respectively12cm long, 44cm long and 56cm long. Cut them into small sticks of equal length. How many centimeters are there left?
Answer: Find the greatest common divisor of12,44,56 here! Do the math yourself!
Question 10: How much glass does a cube fish tank cover with a side length of 50 cm need?
The answer is: 50 * 50 * 5 = 12500 (square centimeter).
Question 1 1: From 8 to 10 people, a bag of candy can be counted. How many sweets are there in this bag?
Answer: Here is the least common multiple of 8 and 10.
Question 12: there is a box of milk, and 5 or 7 people have a bottle of milk left. How many bottles are there in the milk box?
Answer: Excuse me, here is the least common multiple of 5 and 7+1.
Question 13: What is the area of another rectangular parallelogram with a length of 40 meters, a width of 45 meters and a bottom of 75 meters? Are equal. What is the height of this parallelogram?
Answer: 40 * 45 = 1800 (square meter)
1800/75 = 24 (m)
14 question: what about this area? The triangle is 3.4 square meters. What is the area of the ground outline parallelogram?
Answer: 3.4 * 2 = 6.8 (square meters)
Question 15: The rectangular pool is 8.5m long, 4m wide and1.5m deep. What is the bottom area of the swimming pool? ? How many square meters?
Answer: 8.5 * 4 = 34 (meters)
Question 16: A rectangular wooden box is 12 decimeter long, 8 decimeters wide and 6.5 decimeters wide. If it is an invitation painting, what is the area of the painting? How many square decimetres?
Answer:12 * 8+(12× 6.5+8 * 6.5) * 2 = 356 (square decimeter).
Question 17: The trapezoidal bottom is 5m, the bottom12m and the height is 8m. What is its area?
Answer: (5+12)×8 = 68 (square meter)
Question 18: rectangular box, 0.8m long, 0.6m wide and 0.4m high. How much material is there to make this box at least?
Answer: (0.9 * 0.6 +0.6 * 0.4 +0.9 * 0.4)* 2 = 228 (square meter)
Question 19: The length of the grid is 0.6m.. What is the minimum material for cartons?
Answer: 0.6 * 0.6 * 6 = 2. 16 (square meter) 1000 M.
Question 20: When he goes to school, he walks 100 meters every minute. How long does it take to get back to school?
Answer:1000/100 =10 (minutes) = 1/6 hours 2 1. The greatest common divisor of two numbers is 30, and their least common multiple is 180. Yes, the number is 180. Can you find another number?
Answer: 30 every four meters
From one end of the playground, the original length was 22 meters and 96 meters, and a small red flag was inserted from one end to the other. Now it is changed to a small red flag, and a small red flag is pulled out every 6 meters?
Answer: Because I saw on the playground that there are 96 red marks every 4 M, with the length of ***96, except for the face, because every 6m, 4 = 24, 3-64 = 122 = 12 is red, except for the face 2, two marks are pulled out, and 24 =/kloc-.
23 25 peaches and 75 oranges, pointing to the number of children, peaches and oranges, don't they equal the number of children per serving? Every child likes to eat peaches? Orange is the first place?
Answer: (25,75) = 25 (25 is the greatest common divisor of 25 and 75) 75/25 = 3.
25/25 = 1
It can be divided into 25 children, each with a peach and three oranges.
24。 Lan Lan's parents work in other places, and she lives in her grandmother's house. Mom, dad sees her every six days and every nine days. Do you think mom and dad will see her at least in a few days? How many times did their family get together in two months? 60/ 18 = 3 ...
Answer 6 days: (6,9) = 18 days (18 is the least common multiple of 6 and 9).
Her parents will visit her for two months, and it will take at least 18 days to reunite with her family.
Bus No.25 runs every six minutes, get on the bus, 15 runs every eight minutes, and buses, buses, 12 minutes. Now the No.3 bus will leave from the starting point at the same time. How many minutes will it take at least? The No.3 bus will leave at the same time.
Answer: 6 = 2 * 3
8 = 2 * 2 * 2
12 = 2 * 3 * 2
3 * 2 * 2 * 2 = 24
26。 The length is 72 cm and the width is 48 decimeters. The biggest factor is that the largest square tablecloth is cut by 24 decimeters, and the side length is 2 decimeters.
Answer: (72÷24)×(48÷24)= 3×2 = 6.
It can be reduced to six.
27。 Aunt Ross and Clivia water once every four days, and Clivia water once every six days. How many days do these two flowers water at least?
Answer 4 and the least common multiple of 6 to 24 days, equal to
28 30 cakes, oranges, the number of children at 36 o'clock, the per capita income is equal, how many children are there?
A: The greatest common divisor of 30 and 36 is equal to 6.
29 meters 50 kg, M60 60 kg, 90 kg for the next meter. Is the number of heavy packaging bags equal to the kilograms of various rice packages and the weight of each piece of luggage?
A: The greatest common divisors are 50.60 and 90, which are equal to 10.
48 30 24 safflower 0.36 flowers, yellow and purple flowers, bouquets, let the bouquets have as many flowers as possible. A bunch of flowers?
Answer: Find the greatest common divisor of 24.36 and 48, which is equal to 65,438+02.
3 1。 It has a cuboid, its width is three times its height, and its width, height and length are equal. Now cut the knife horizontally and vertically to increase the surface area of four small rectangles? 200 square centimeters. How much was the original box?
Answer: Set the width to 3A and the length to 4A.
The surface area of vertical cutting increases? After 2 * 3A 4A, the surface area after crosscutting increased by 2 * A * 3A.
24A ^ 2 +6 ^ 2 = 200
=(20/3)^ 0.5
The volume v =12a3 =160/3 * (15) 0.5/> 32. Rectangular fish tank, uncovered, 0.6 m long, 0.25 m wide and 0.3 m deep. Don't use at least a few square meters of glass in the fish tank.
Answer: 0.4×0.25 +2×0.25×0.3 +0.4×0.3.
= 0. 1 +0. 15 +0.24
= 0.49 m
Lines 33 and 36 cm are folded into a cubic frame. What is the side length of this cube? Quan Huafu paper surface, at least how many square centimeters of paper?
Answer: 36÷ 12 = 3 cm.
6×3×3
=54 square centimeters
34。 The side of a rectangle with a square bottom is square, the height of the rectangle is 8 cm, and its volume is.
A:
Rectangular height = bottom circumference = 8 decimeters
The length of the base of a cuboid = 8÷4 = 2 (decimeter)
Volume = bottom area × height =/a >
35. 12 block, 2×2×8 = 32(DM) sugar is distributed to three people on average. What is the sugar per serving?
12/3 = 12/3
36。 How many square centimeters is a cube whose surface area is less than the original surface area 120 square centimeters?
Answer: 120÷4 = 30 (square centimeter)
3×4+1×2 = 14(a) Small cube area
14×30 = 420 (square centimeter) 30×6×3 = 540 (square centimeter)
37 long, 24 wide, 9 high, 8 rectangular water tanks to 6 deep water, and then placed on the side of a 5 cubic iron, how much does the water level rise?
Answer: 5×5×5(24×9)
=
≈ 125÷2 16 0.5787
The side length of the cube is 84 cm. How many cubic centimeters is its volume? How many square centimeters is the basal area?
A: Eighty-four out of twelve = 7 (cm) to.
Quantity: 7 * 7 * 7 = 343(CC)
Bottom area: 7 * 7 = 49 (square centimeter) 391.50m maintenance. On the first day, the total length of 1/4 was 90 meters, and it was repaired the next day, and then there was no maintenance left. How long is this paragraph?
Part of the track length of the answer set is x meters.
1/4X +90 + 150 = X-
x- 1/4X = 3/4X = 240 90+ 150
& gt
X = 320
A pile of sand on the construction site accounts for 2/3, only 60 tons. How many tons is this pile of sand? answer
60/2/3 = 90 tons
4 1, 5000 kg wheat flour, 4250 kg wheat flour output.
The answer is 4250 * 100% = 85%.
The flour yield of 42 pieces of wheat is 80%, and the flour is 640 kg. How many kilograms of wheat?
Answer 640/80% = 800 (kg)
Wang's sporting goods store bought five footballs and paid 100 yuan back to 32.5 yuan. How much is each football? exist
Answer (100-32.5)/ 5 = 13.5 (yuan)
44. I bought 25 Jin of cabbage in the canteen first, and 175 Jin of cabbage for the second time, at 6 cents per Jin of cabbage. How much did it cost to buy a cabbage canteen?
Answer (25+175)* 6 = 1200 (angle) = 120 (yuan)
45 Xiaohua Xiaogang is reading a book. When Xiaohua was here, 132 Xiaogang gave me three days of light. Who reads fast? Why?
Answer quickly!
Xiaohua: 132/4 = 33 (page)
Xiaogang: 96/3 = 32 (page)
Two-thirds of the original 72 basketballs in the 46 sporting goods store were sold and 45 were bought. Is there only basketball now?
Answer 72 * 2/3 = 48 (only)
72-48 = 24 (only)
24 +45 = 70 (only)
A rectangle is 0.54 m long, more than 8 cm wide and 5 cm high. How many square meters is it? The cuboid of?
The answer is 0.54m = 54cm.
54-8 = 46 cm
54 * 46 * 5 =1.242m2 =12420cm2, steel bar.
48 1 cutoff length, 2/5 meters, how many meters? Peach tree 1/3, pear garden 1-2/5 = 3/5 meters.
Forty nine
The answer plan used a piece of land and the remaining apple trees. How many parts does an apple tree have?
Answer:1-(2/5+1/3) = 4/15.
A rectangular pool, 5 meters long, several meters wide and three times wide?
Answer 5 * 3 = 15 meters, these are slightly obvious! Hope to adopt!