The summer vacation is already over half! Every summer vacation is the easiest time to study in a semester, but you must not relax, but summer homework is an indispensable position. Students, have you finished your homework? Now I have sorted out the answers to the summer homework of mathematics in the second volume of the fifth grade of Jiangsu Education Press. The answer is for reference only. Everyone should remember to finish homework independently and cultivate the ability of independent thinking.

Su Jiaoban fifth grade second volume math summer homework answer

First of all, simple calculation

6.5÷ 1.25÷8 1.25×0.25×0.05×64

=6.5÷ 1.25×8 = 1.25×0.25×0.05×8×2×4

=6.5÷ 10 = 1.25×8×0.25×4×0.05×2

=0.65 = 1

? +- 4.9×4+5. 1÷0.25

=23/30 =4.9×4+5. 1×4

=4.9+5. 1 ×4

=40

fill (up) a vacancy

1, Xiao Ning mistook addition for multiplication when calculating an addition problem, and got 1 10. Knowing that the difference between these two addends is only 1, the correct result is 2 1.

2. Divide 14 by the sum of several natural numbers, and then multiply these natural numbers to get the maximum product, namely 120.

3.50÷7 The fourth digit after the decimal point of the quotient is 8, and the100th digit after the decimal point is 8.

4. In series 7, 10, 13, 16, 19 ... The eighth number is 28, and 907 is 30 1.

5. The average height of the three students is 130cm. If one more student is added, their average height will reach 132cm. The height of this late student is 138 cm.

6. After the decimal point of a number is moved one place to the left, it will be 25.56 smaller than the original, and the original number is 28.4.

7. Use the five numbers of 3, 4, 5, 8 and 9, and the numbers will not be used repeatedly every time. If the multiplication formula of two digits is formed, the product of 94 × 85 is the largest; If the formula of multiplying three digits by two digits is formed, the product of 489 × 35 is the smallest.

8. Give a group of people a basket of apples. There are 5 apples per person, and there are 16 apples left. There are 20 apples short of 7 apples per person. There are 18 people in this group. * * * There are 106 apples.

9. Party A, Party B, Party C and Party D bought 10 loaves of bread and shared them equally. Party A paid for six loaves of bread and Jim paid for two loaves of bread without any money. After eating, Party D should take out 1.25 yuan, and Party A should take back 1.75 yuan.

10. In the figure on the right, the shaded part BCGF is square, the line segment FH is 30 cm long, the line segment AC is 50 cm long, and the circumference of the large rectangle ADHE is 160 cm.

Third, the application problem.

1, A and B are 3300m apart. A starts from A and B at the same time and runs back and forth between A and B. A runs 300 meters per minute and B runs 250 meters per minute, and stops exercising after 35 minutes.

How many minutes did it take A and B to meet for the first time?

(2) How many times have two people met?

① 3300÷300+250=6 minutes

②35÷6=5 times ... five minutes.

A: Omit.

2. The school is going to issue 10 pencils to every student who takes part in the long-distance running as a souvenir. But three people didn't come this day, and as a result, two more people came each, leaving six. How many people actually come to participate in the long-distance running?

10×3-6=24 24÷2= 12 people.

A: Omit.

3. In the supermarket, the Xiaolong family bought 1 kg candy and 3 kg biscuits, and paid 35.6 yuan. Xiao Lijia bought the same candy and biscuits, each weighing 3 kilograms, and paid 62.4 yuan. How much are these sweets and biscuits per kilogram?

62.4-35.6 ÷ 3-1=13.4 yuan ...

35.6- 13.4 ÷3=7.4 yuan ... cookies.

A: Omit.

4. Zhang Hua, a fifth grader, is with Li Yue's family. After school in the afternoon, Zhang Hua walked home at a speed of 150 meters per minute. Eight minutes after Zhang Hua left, Li Yue rode home and caught up with Zhang Hua in 10 minutes. How many meters per minute is it feasible to ride a bike in Li Yue?

8+10×150 ÷10 = 270 m/min.

A: Omit.

Guangyu construction team hired two trucks to transport 76 tons of cement from the building materials warehouse to the construction site. Large trucks can transport 5 tons each time, and the freight is in 85 yuan each time; The pickup truck can transport 3 tons each time, and the freight is in 60 yuan each time. How many times does it take to rent a big truck and a small truck to get the freight to the lowest cost? * * * How much is the freight?

76÷5= 14 times ... 6 tons

6÷3=2 times

14× 85+2× 60 =1310 yuan.

A: Omit.

Fourth, explore the problem

1. The 1 unqualified part put by worker Xiao Wang next to the inspector has the same appearance as other parts, so it is considered as a qualified part and mixed with 27 qualified parts with the same weight. Which side of the existing balance with indicators is heavy, the indicators will be biased; Both sides are equally heavy, and the index refers to the middle. How many times do you weigh it, you can definitely find out the unqualified part? Please briefly explain the idea or operation steps: as few times as possible.

biquadratic

In the "Century Cup" football match, Team A, Team B, Team C and Team D are in the same group. In the group stage, each of the four teams will play a game with the other three teams. According to the regulations, the winning team gets 3 points and the losing team gets 0 points. If both sides draw, both teams are 1 point. It is understood that after the game:

1 the final total score of these four teams happens to be four consecutive odd numbers;

Team b ranked first in the total score;

Team D had only two draws with the other team, one of which was tied with Team C. ..

Q: Which team ranked fourth in total score? How many points did he get in the final exam?

The fourth team was Team C, and finally got 1.