Can anyone help me solve this elementary school math problem?

There is no single solution to this problem!!

Proof is that if the trapezoid is divided into a triangle congruent with triangle a and a parallelogram by dividing the trapezoid into a triangle congruent with triangle a, the area of the parallelogram is 12 square centimeters. In the case of a small parallelogram that does not move, a large parallelogram can extend infinitely to the left, so its bottom length can be changed at will.

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Note: The correct understanding of the lower bottom of the trapezoidal shape should be the lower bottom of the longer bottom, otherwise it is 2cm).

B is 12 square centimeters larger than A, and is actually one larger: the bottom is a trapezoidal lower base, and the height is a parallelogram of 6 centimeters.

The area of this parallelogram is 12 square centimeters, the height is 6 centimeters, and the base is: 12 6 2 (centimeters).

That is, the bottom of the trapezoidal shape is 2 cm.

The area of the trapezoid = (upper bottom + lower bottom) height 2 = 3 upper bottom + 3 lower bottom.

Because it is a parallelogram, the base of the triangle = the bottom of the trapezoid - the bottom of the trapezoid.

Area of the triangle = base height 2

Bottom - Top bottom) High 2

3 Bottom - 3 Top bottom.

As the title suggests, the area of the triangle + 12 = the area of the trapezoid.

3 Bottom - 3 Top Bottom + 12 = 3 Top Bottom + 3 Down Bottom.

3 top bottom + 12 = 3 top bottom.

12 = 6 upper bottom.

Top bottom = 2

。。。The first solution is right, but the result is wrong... Great Khan

The smallest of the numbers that can be divided by 3 by 2 4 by 3 by 3 by 3 by 3 by 2 4 by 3 5 by 4 is (59) Both numbers are composite numbers and are coprime numbers, and their least common multiple is 420, and there are (7) pairs of such numbers.

The sum of two numbers is 252, and their greatest common factor is 28, and there are (4) groups of such numbers.

252 28 = 9, then there is a natural number of 1+8, 2+7, 3+6, 4+5 divided by 5 6 7 The remainder is 1 within 1000 There are (4) such numbers.

Natural numbers n=5*6*7*a+1=210a+1,a=1,n=211,a=2,n=421,a=3,n=631,a=4,n=841

Subtracted (Minus Difference) Subtracted - Subtracted = 0

Dividend (Divisor Quotient) Dividend Dividend Dividend = 1

Because it costs yuan to buy one kilogram of apples and one kilogram of pears, it costs yuan to buy four kilograms of apples and four kilograms of pears, and because it costs yuan to buy four kilograms of apples and three kilograms of pears, it costs yuan to buy one kilogram of pears.

Let soccer be x-yuan and volleyball be.

20x+30（

20x+30x-144=1356

50x=1500

x = yuan) football unit price 30 yuan volleyball unit price yuan.

After explaining it to your daughter, it's better to let your daughter do it herself, it's related to his future, and you have to give her a lecture.

1: Buy 4 kg of apples and 3 kg of pears to share the yuan, buy 1 kg of apples and 1 kg of pears to pay yuan, how much does it cost to buy 1 kg of pears?

3 kg of apples and 3 kg of pears to cope.

Yuan) 1 kg of apples to.

Yuan) 1 kg of pears to.

Yuan) 2: The school bought 20 soccer balls and 30 volleyballs, and paid a total of 1356 yuan, each soccer ball is more expensive than each volleyball, how much is the unit price of soccer and volleyball?

20 soccer balls are more expensive than 20 volleyballs.

yuan) 20 30 50 (pcs).

Volleyball. 1356 96 1260 (yuan).

Every volleyball. 1260 50 yuan).

Every football. Meta).

1 kg of apples and 1 kg of pears cost yuan.

If you buy 4 servings, it is 4 kg of apples and 4 kg of pears, you need:

Meta).It is also known that 4 kg of apples and 3 kg of pears need yuan.

Compare and see:

4-3 = 1 kg of pears, need: yuan.

Each soccer ball is more expensive than volleyball.

20 footballs, more expensive than 20 volleyballs: yuan.

Subtract 96 yuan from the total of 1356, and the rest is the price of 20 + 30 = 50 volleyballs.

Per volleyball: (1356-96) (20+30) = RMB.

Each football: yuan.

1.Solution: If you want to buy 1kg of pears for x yuan, then buy 1kg of apples for yuan.

4 (x=x=A: Buy 1 kg of pears for yuan.)

2.Solution: If you buy a volleyball and spend x yuan, you will buy a football ball.

20（96+20x+30x=1356

50x=1356-96

50x=1260

x = A: The unit price of volleyball is RMB, and the unit price of football is 30 RMB.

1. Set 1 kilogram of pears to be x yuan, and one kilogram of apples to be (yuan.)

4 (x = the unit price of football is x yuan, and the unit price of volleyball is y yuan.)

20x+30y=1356

x-y=x=30y=

1.Solution: If it costs X yuan to buy 1 kilogram of pears, then it costs yuan to buy 1 kilogram of apples.

4 (x=x=A: Buy 1kg of pears for yuan.)

4x+3y=

x+y= simultaneous equation gives y=

20x+30y=1356

x-y = simultaneous equation x=30 y=

If you don't understand in the future, you can come to me, I'm a person who is full and fine.

The first element.

Question 2 (Yuan (volleyball) football).

Because 2 = 8

So the edge length of the cube is 2m

A: It can accommodate up to 750 such containers.

The answer is 750 and the algorithm is as follows:

The side length of the cube is 2m, first consider the shortest side, height, 5 2=, rounded, so only two can be loaded in consideration of width, 30 2 = 15, long, 50 2 = 25

Finally: 2*15*25=750

The volume of the cuboid = 50 * 30 * 5 = 7500 cubic meters 7500 8 = 937 remainder 4

So it can accommodate 8 cubic meters of cargo boxes 937.

Box volume: 50 * 30 * 5 = 7500

Number of cubes: 7500 8=

Take an integer to 937

Three-dimensional painting** It comes out at a glance.

25 15 2 = 750 pcs.

8 = 2 * 2 * 2

So 25 15 2 = 750 (pcs) A: Up to 750 such crates can be accommodated.

Let the bent potato be A, the Chaqiao radish be B, the cucumber be C, and the eggplant be D

4c=3a4d=4a

4b=5ac=3/4a

d=ad=5/4a

3 Dirt Defeat Fierce Beans.

1 cucumber = 3 4 potatoes.

1 eggplant = 1 potato.

1 radish = 5 4 potatoes laughing celery early.

This adds up to 1 cucumber, 1 eggplant plus 1 radish and 3 potatoes.

4 cucumber slow key punch = 3 potatoes, i.e. 1 cucumber = 3 4 potatoes.

4 eggplant = 4 potatoes, i.e. 1 eggplant = 1 potato.

4 radish = 5 potatoes, i.e. 1 radish = 5 4 potatoes.

Then 3 4 + 5 4 + 1 = 3 (pcs).

Answer: 1 cucumber, 1 eggplant and 1 radish are as heavy as 3 annoying potatoes.

1.Think of it this way: the original ticket was 15 yuan, and 1 ticket was sold; Sell 2 tickets after the price reduction, and increase your income by 20%.(15% of 120% is 18).

18 2 = 9 (yuan).

2.The method is difficult. The ratio of the amount of money spent this month is 2x:x

2x+2000):(x+3000)=3:2 The solution is x=5000That is, the ratio of the amount of money spent in the mountain is 10,000 yuan and 5,000 yuan.

This month, Master Wang's or rent-only income is 2,000 + 10,000 = 12,000 yuan.

3.The number of the first group is compared to the number of the second group.

1, the clan ordered to set up a drop x total number of people in the mega cover is 1,15-x)*2-15= 15x20%.

15-2x= 3

x=6 is six dollars.

2, set the king's income x, then Su's income 2 3x; If the king spends y, then Su spends 1 2y.

x-y=2000.

2/3x-1/2y=3000

x=12000

3, It's a bit difficult to simplify the limbs, let the old man think about it.

Solution: Price reduction by X yuan.

15 (1+20 100)=(15-x) 2 solution x = 6 yuan before the reserve.

Solve the feast: The number of the first group is x. The number of the second group is y.

Solution x rollover y=182 78

This is an elementary school topic, so difficult.