A triangular piece of land with a bottom height of 358m and a height of160m. What is the area of this land? How many hectares?
Zhang Ming and Li Hong started from two places at the same time and came relatively. Zhang Ming walks 50 meters per minute and Li Hong walks 40 meters per minute. 12 minutes later, they met. How many meters are they apart?
The distance between A and B is 255 kilometers, and two cars leave both places at the same time. Car A travels 48 kilometers per hour and car B travels 37 kilometers per hour. Two cars meet in a few hours.
Xiangqun Stationery Factory can produce 250 stationery boxes per hour. How many hours can you produce 10000?
The factory sent a batch of coal, burned 28 tons, and left 13 tons. How many tons is this batch of coal?
A rectangular iron box, length 18cm, width 15cm and height 12cm. How many square centimeters of iron does it take to make this iron box?
The side length of a cube is15cm. What is its surface area and volume?
When does the big clock of the railway station strike a few times, for example, 1, 2 o'clock, every half hour. Ask this big clock?
The master works 8 hours, the apprentice works 6 hours, and * * * makes 3 12 parts. It is known that the number of parts made by the apprentice in 5 hours is equal to that made by the master in 2 hours. How many parts do the master and apprentice make every hour?
Xiao Ming drinks a cup of pure milk, first 20%, then add water and mix well, and then drink half a cup. What percentage of pure milk is left in the cup?
Xiao Qiang used to write an average of 25 words per minute, but now he writes an average of 40 words per minute. What percentage does Xiao Qiang type more now than before?
In the past, there was a children's clothing and a 20 yuan. After the price increase of 10% last year, the price will be reduced by 10% this year. What's the current price?
It used to take 10 hours to go to Beijing by train from Wuhan, but now the train is speeding up and it will arrive in 8 hours. How much time does it save to go to Beijing by train now?
Li Ming's family used to use 120 kwh per month, but now it uses about 90 kwh per month due to node measures. What percentage are you saving now?
The ratio of category 6 (1) to category 6 (2) is 5:4. What percentage of students in Class 6 (1) are more than those in Class 6 (2)?
The road team plans to build 4.5 kilometers of roads, and three-eighths of them have been built. It hasn't been fixed for long.
There are 120 workers in a workshop. After it snows, five-eighths of male workers and three-sevenths of female workers go to sweep the snow. It is understood that it takes 64 people to sweep snow. How many women workers are there in this workshop?
Cut off a third of the cylindrical steel. The side length of the cut steel is square, and the circumference of the square is 50.24 cm. How many cubic centimeters is the raw steel? If steel weighs 7.8 grams per cubic centimeter, how many kilograms does the raw steel weigh? (The number shall be kept to one decimal place)
If 18 people are transferred from the first workshop to the second workshop, the first workshop is one quarter more than the second workshop. How many people are there in the two workshops?
Answer:
Chickens and rabbits in the same cage: 18*6= 108 (strips)
118-108 =10 (article)
8-6= 2 (bar)
10/2=5 (only) ... Spider; Spider-like objects; Star wheel; Cross; Connecting handle; crosshead
18-5= 13 (only) ... Dragonflies and cicadas
13* 1= 13.
20- 13=7 (right)
2- 1= 1 (right)
7/ 1=7 (only) ... Dragonflies
13-7=6 (only) ...
358* 160/2
=57280/2
= 28,640 square meters
28,640 square meters ≈43 hectares
(40+50)* 12
=90* 12
= 1080 (m)
2 255/(37+48)
=255/85
=3 (hours)
1 solution: assume that x hours can produce 10000 pieces.
250x= 10000
250x/250 = 10000/250
x=40
Solution: suppose this batch of coal has x tons.
x-28= 13
x-28+28= 13+28
x= 4 1
( 18* 15+ 18* 12+ 15* 12)*2
=(270+2 16+ 180)*2
=666*2
= 1332 (square centimeter)
2 Surface area: 15* 15*6
=225*6
= 1350 (square centimeter)
Volume: 15* 15* 15
=225* 15
=3375 (cubic centimeter)
Arithmetic progression: (1+12) *12 * 2 =156 * 2 = 312 (below)
1*24=24 (below)
24+3 12=336 (below)
Apprentice efficiency: Master efficiency = 2: 5.
Apprenticeship time: Master time = 5: 2.
6/5*2=2.4 (hours)
3 12/(8+2.4)=30 (pieces) (main)
30/5*2= 12 (individual) (apprentice)
1 x ( 1-20%) X 50% = 40%
1 x ( 1-20%) X 50% = 40%
(40-25)÷25=60%
20× (1+10%) ⊙ (1-10%) = 20.8 yuan.
( 10-8)/ 10* 100%=20%
( 120-90)/ 120* 100%=25%
(5-4)/4* 100%=25%
180× (4.5÷ 3)+180 = 450 (km)
1÷5/8= 1.6
64× 1.6= 102.4
120- 102.4= 17.6
3/7× 1.6=24/35
17.6÷ (1-24/35) = 56 (person)
50.24 ÷ 4 = 12.56 (cm)
12.56 ÷ 1/3 = 37.68 (cm)
12.56 ÷ 3. 14 ÷ 2 = 2 (cm)
Volume: 3. 14× 2× 37.68 ≈ 473 (cubic centimeter)
Weight: 473× 7.8 = 3689.4g ≈ 3.7kg.
Suppose there are x people in the second workshop and 1.5x people in the first workshop.
1.5x- 18 =( 1+ 1/4)X
X=72， 1.5X= 108