Aunt Wang spent 39.1 yuan to buy 8 kilograms of apples and bananas. It is known that apples cost 7.2 yuan per kilogram and bananas 3.5 yuan per kilogram? Please use the equation

Aunt Wang spent 39.1 yuan to buy 8 kilograms of apples and bananas. It is known that apples cost 7.2 yuan per kilogram and bananas 3.5 yuan per kilogram? Please use the equation

Suppose the Apple bought x kg and the banana bought y kg
x+y=8
7.2x+3.5y=39.1
Solution x = 3, y = 5

Aunt Zhang went to the supermarket to buy 4 kg bananas and 3.5 kg apples, which cost 24.2 yuan. It is known that the price of banana is 3.6 yuan per kg, and how much is the price of apple per kg?

Suppose the price of apple is x yuan, from the question meaning: 4 × 3.6 + 3.5x = 24.2 & nbsp; 14.4 + 3.5x = 24.2, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 3.5x = 9.8, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 2.8

Aunt Li went to the supermarket to buy 3kg bananas and 2kg apples, which cost 16 or 8 yuan. The price of a kilogram of bananas is 1 or 2 times that of an kilogram of apples
How much is it per kilogram of banana? How much is it per kilogram of apple;

Suppose x yuan per kilogram of apples, then 1.2x yuan per kilogram of bananas
3×1.2x + 2x = 16.8
That is, 3.6x + 2x = 16.8
The solution is x = 3
So 3 yuan per kilogram of apple, 3.6 yuan per kilogram of banana

Mingming and LeLe read a story book at the same time. Four days later, Mingming read one fifth of the story book and LeLe read one sixth of the story book. Who has more than one?

Because one fifth is more than one sixth, Lele has more left

200 oral problems, 100 off form, 100 simple calculation, 100 practical problems
Ah, if you can't finish it, you can choose one of them
OK

2.8×0.4＝ 1.12
14－7.4＝6.6, 1.92÷0.04＝48, 0.32×500＝160, 0.65＋4.35＝ 5
10－5.4＝4.6, 4÷20＝0.2, 3.5×200＝700, 1.5－0.06＝1.44
0.75÷15＝0.05, 0.4×0.8＝0.32, 4×0.25＝1, 0.36＋1.54＝2
1.01×99＝99.99, 420÷35＝12, 25×12＝300, 135÷0.5＝270
3/4 + 1/4 =1, 2 + 4/9 =22/9, 3 - 2/3 =7/3, 3/4 - 1/2= 1/4
1/6 + 1/2 -1/6 =1/2, 7.5-(2.5+3.8)=1.2, 7/8 + 3/8 =5/4
3/10 +1/5 =1/2, 4/5 - 7/10 =1/10, 2 - 1/6 -1/3 =1.5
0.51÷17＝0.03, 32.8＋19＝51.8, 5.2÷1.3＝4, 1.6×0.4＝ 0.64
4.9×0.7＝3.43, 1÷5＝0.2, 6÷12＝0.5, 0.87－0.49＝0.38
2/1*2=1 3/1*3=1 3/2*3=2 3/1*6=2
4/3*8=6 5/3*20=12 7/3*14=6 8/7*40=35
4/3*16=12 9/5*27=15 2/1*30=15 12/7*24=14
30/1*30=1 51/9*102=18 19/9*76=36 4/9*8=18
5/8*90=144 99/98*99=98 3/14*6=28 7/1*28=4
10/1*90=9 5/3*105=63 19/7*38=14 5/1*25=5
8/19*16=38 61/60*122=120 7/2*28=8 6/1*48=8
9/7*18=14 25/7*100=28 9/5*81=45 8/9*16=18
2/1*2=1 3/1*3=1 3/2*3=2 3/1*6=2 4/3*8=6 5/3*20=12 7/3*14=6 8/7*40=35 4/3*16=12 9/5*27=15 2/1*30=15 12/7*24=14 30/1*30=1 51/9*102=18 19/9*76=36 4/9*8=18 5/8*90=144 99/98*99=98 3/14*6=28 7/1*28=4 10/1*90=9 5/3*105=63 19/7*38=14 5/1*25=5 8/19*16=38 61/60*122=120 7/2*28=8 6/1*48=8 9/7*18=14 25/7*100=28 9/5*81=45 8/9*16=18
12÷3/5=12×（ 5/3） 9÷6/7=9×（ 7/6 ） 30÷5/6=30×（6/5 ） 4×（3/2 ）=4÷2/3 （ 4 ）÷5/7=4×7/5 3÷4/5=3×5/4 （ 24 ）÷7/16=24×（16/7 ） A÷C/B=A×B/C 4÷4/5=5 6÷3/4=8 10÷2/5=25 18÷4/9=81/2 4×4/5=16/5 6×3/4=18/4 10×2/5=4 18×4/9=8 3÷3/4=4 2÷1/3=6 6÷4/5=15/2 1÷5/7=7/5 3/4÷3=1/4 1/3÷2=1/6 4/5÷6=2/15 5/7÷1=5/7
2/1*2=1 3/1*3=1 3/2*3=2 3/1*6=2
4/3*8=6 5/3*20=12 7/3*14=6 8/7*40=35
4/3*16=12 9/5*27=15 2/1*30=15 12/7*24=14
30/1*30=1 51/9*102=18 19/9*76=36 4/9*8=18
5/8*90=144 99/98*99=98 3/14*6=28 7/1*28=4
10/1*90=9 5/3*105=63 19/7*38=14 5/1*25=5
8/19*16=38 61/60*122=120 7/2*28=8 6/1*48=8
9/7*18=14 25/7*100=28 9/5*81=45 8/9*16=18
3/4 + 1/4 =1, 2 + 4/9 =22/9, 3 - 2/3 =7/3, 3/4 - 1/2= 1/4
1/6 + 1/2 -1/6 =1/2, 7.5-(2.5+3.8)=1.2, 7/8 + 3/8 =5/4
3/10 +1/5 =1/2, 4/5 - 7/10 =1/10, 2 - 1/6 -1/3 =1.5
0.51÷17＝0.03, 32.8＋19＝51.8, 5.2÷1.3＝4, 1.6×0.4＝ 0.64
4.9×0.7＝3.43, 1÷5＝0.2, 6÷12＝0.5, 0.87－0.49＝0.38
2/1*2=1 3/1*3=1 3/2*3=2 3/1*6=2
4/3*8=6 5/3*20=12 7/3*14=6 8/7*40=35
4/3*16=12 9/5*27=15 2/1*30=15 12/7*24=14
30/1*30=1 51/9*102=18 19/9*76=36 4/9*8=18
5/8*90=144 99/98*99=98 3/14*6=28 7/1*28=4
10/1*90=9 5/3*105=63 19/7*38=14 5/1*25=5
8/19*16=38 61/60*122=120 7/2*28=8 6/1*48=8
9/7*18=14 25/7*100=28 9/5*81=45 8/9*16=18
1、 Write the results directly
0.8＋0.6= 1.25×80= 5.24＋3.76= 625×0.8= 4.2－3.6= 0.32÷16=13＋0.26=
9.6÷16= 14.5－0.24= 4÷8= 1.3＋8.46= 0.8－0.45= 5×2.4= 1－0.01= 8.1÷3=
2.4÷12= 250×0.4= 20.5＋2.05= 37.5×400= 0.78＋2.2= 1.5×8= 6×1.5=
25×0.4= 9.6÷16= 4－0.04= 4.15＋0.85= 10－0.1= 0.13×7= 9.6÷4= 0.16÷8=
2、 Column vertical calculation
1.64＋2.35= 8.65－6.31= 28.448÷14= 0.58×250= 12.5＋3.6=
10.88÷34= 10－7.64= 1.86×7= 13.88－6.29= 926×0.15=
8 △ 500 = 26.3 + 7.93 = 23 × 7.06 = 100.2-2.28 = 44 △ 9 (accurate to percentile)
3、 Calculation (can be easily calculated with a simple method)
8×25×1．25×16 4．04×250 45．55－（6．82＋15．55）
3．2×99＋3．2 4.8×39＋61×4．8 34．52－17．87－12．23
2．5×56+4．5×65 489×101－489 4．57+3．17+3．43+5．83
（85＋40）×（20－5） 578－405÷45×16 4．6×56＋48×4．6－4．6×4
1. 3/7 × 49/9 - 4/3
2. 8/9 × 15/36 + 1/27
3. 12× 5/6 – 2/9 ×3
4. 8× 5/4 + 1/4
5. 6÷ 3/8 – 3/8 ÷6
6. 4/7 × 5/9 + 3/7 × 5/9
7. 5/2 -（ 3/2 + 4/5 ）
8. 7/8 + （ 1/8 + 1/9 ）
9. 9 × 5/6 + 5/6
10. 3/4 × 8/9 - 1/3
11. 7 × 5/49 + 3/14
12. 6 ×（ 1/2 + 2/3 ）
13. 8 × 4/5 + 8 × 11/5
14. 31 × 5/6 – 5/6
15. 9/7 - （ 2/7 – 10/21 ）
16. 5/9 × 18 – 14 × 2/7
17. 4/5 × 25/16 + 2/3 × 3/4
18. 14 × 8/7 – 5/6 × 12/15
19. 17/32 – 3/4 × 9/24
20. 3 × 2/9 + 1/3
21. 5/7 × 3/25 + 3/7
22. 3/14 ×× 2/3 + 1/6
23. 1/5 × 2/3 + 5/6
24. 9/22 + 1/11 ÷ 1/2
25. 5/3 × 11/5 + 4/3
26. 45 × 2/3 + 1/3 × 15
27. 7/19 + 12/19 × 5/6
28. 1/4 + 3/4 ÷ 2/3
29. 8/7 × 21/16 + 1/2
30. 101 × 1/5 – 1/5 × 21
1) The fruit shop carries 390 kg of apples, bananas and pears a day. The weight of apples is 1.5 times that of pears, and the weight of bananas is 3 / 4 that of pears. How many kg of each of the three kinds of fruits?
(2) One half and five barrels of water are used, and 30% is left. How many barrels of water are there?
(3) There is a fast edge of 20 cm long cube wood, planed into a cylinder with the largest diameter at the bottom. What is the volume of planed wood?
(4) A steel pipe is 10 meters long. The first time we cut off 7 / 10 of it, and the second time we cut off the remaining 1 / 3. How many meters are left?
(5) Two groups assemble radios. Group a assembles 50 radios a day, and completes 10% of the total task on the first day. Then group B starts to assemble 40 radios a day. How many days did group a finish this task?
(6) After two thirds of the total length of a highway is completed, it is 16.5km away from the midpoint. How many kilometers is the total length of this highway?
(7) The apprentice made 2 / 7 of the total parts, 21 less than the master. How many parts are there in this batch?
(8) If the two teams build a road, team a will build one fifth of the total length every day, and team B will do it in 7.5 days. If the two teams work together for two days, and the rest will be built by team B alone, how many days will it take?
(9) There is a batch of chemical fertilizer in the warehouse. Two fifths of the total amount are taken out in the first time, and one third of the total amount is taken out in the second time. There are 12 bags less. At this time, there are 24 bags left in the warehouse. How many bags are taken out in two times?
(10) If the circumference of the rear wheel is 2 meters, calculate the circumference of the front wheel
(11) The number a is 1.2 times the average of the numbers a, B and C. if the sum of the numbers B and C is 99, what is the number a?
(12) A project is planned to use 800 workers and be completed within 100 days. Unexpectedly, 35 days after the start of the project, the project will be stopped due to an accident. The project will continue to start after 25 days. If the project is to be completed within the time limit, how many more workers should be added?
(13) The fruit shop bought several kilos of apples at the price of 2 yuan 1.5 kg, and sold them at the price of 4 yuan 2.5 kg. If the shop wants to make a profit of 100 yuan, how many kilos of fruit must the fruit shop sell?
(14) The speed of a, B and C is 30, 40 and 50 meters per minute respectively. A and B are in place a, C is in place B. B and C are facing each other at the same time. C meets B 10 minutes later. How many meters is the distance between AB and a?
(15) It takes 10 minutes for a to go from the East Village to the West Village, and 15 minutes for B to go from the West Village to the East Village
(16) A car can run two fifths of the whole journey on the first day, one half of the rest on the second day, and one third less on the third day than on the first day. At this time, the remaining distance is 50 kilometers. How many kilometers is the whole journey?
(17) Passenger ships travel 24 kilometers per hour from port a to port B. cargo ships travel from port B to port a in 12 hours. Now they leave at the same time. When they meet, the distance between the two ports is 6:7
(18) The distance between a and B stations is 1134 km. A bus and a truck leave from the two stations at the same time. They meet in 10 hours and 30 minutes. The speed of the truck is 5 / 7 of that of the bus. How many kilometers does the bus travel per hour?
(19) In an assembly workshop, 40% of the male workers are equal to 20% of the female workers. It is known that there are 130 female workers in this workshop. How many fewer male workers than female workers?
(20) There is 25 kg of salt water with 20% salt content. After adding some water, the salt content is 8%. How much water is added?
(21) a total of 307 tons of grain are stored in the three warehouses of a, B and C. After 40 tons of grain are transported out, the weight ratio of the remaining grain in warehouse A and B is 3:5, and the weight ratio of the remaining grain in warehouse B and C is 3:4. How many tons of the original grain in warehouse C?
(22) workshop a and workshop B need to process a batch of flour. The actual completion rate of 130% of the plan is 8:5. Workshop B processes 13.5 tons less flour than workshop A. how many tons of flour is the original plan?
[application question 2]
(1) There are two baskets of fruit. Basket a weighs 32 kg. When 20% of the fruit is taken from basket B, the weight ratio of basket a and basket B is 4:3. How many kg are there in the two baskets?
(2) It is planned to install 120 TV sets. If 8 TV sets are installed every day, the task can be completed one day ahead of schedule. If it is completed four days ahead of schedule, how many TV sets should be installed every day?
(3) The distance between a and B is 1152km. A passenger train and a freight train run from the two places at the same time. The freight train runs 72km per hour, 2 / 7 faster than the passenger train. How many hours do the two cars meet?
(4) How many books have the school bought and distributed to each class? If 25 books are distributed to each class, 22 books will be more; if 30 books are distributed to each class, 68 books will be less. How many classes are there? How many books have the school bought?
(5) The fruit company stores a batch of apples. After 30% of the apples are sold, another 160 boxes are delivered. At this time, there are 1 / 10 more apples than the original ones. How many boxes of apples are there?
(6) The greening team spent 900 yuan to renovate the street garden, which is 300 yuan less than the original plan. What percentage is the saving?
(7) A road repair team built a highway, originally planned to build 200 meters a day, but actually built 50 meters more every day. As a result, the task was completed three days ahead of schedule. How many meters is the total length of the highway?
(8) There is a rectangular ingot with a perimeter of 2 meters at the bottom, a ratio of length to width of 4:1, and a height of 25% less than width. It can be cast into a cone with a height of 3 decimeters. What is the bottom area of the cone?
(9) For a wire, 37.5% of the total length is used for the first time, and 27 meters is used for the second time. At this time, the length ratio of the used wire to the unused wire is 3:2?
(10) Male students in a class