Somebody gave me a math problem, my fifth grade one, which was a little harder, and I gave it an ext

1.How many square meters of cardboard do you need to make a carton with a length of meters, a width of meters, and a height of 6 decimeters? Cardboard thickness centimeters, what is the approximate volume of the carton?

The ratio of the number of people in the school's art interest group and the ** interest group is 5:4, and there are 7 people participating in the art interest group in the middle, and the ratio of the number of people in the two groups is 8:5, and how many people are in each of the original two interest groups.

It takes 5 minutes for the master to make a part, and 9 minutes for the apprentice to make a part, and if the master and apprentice cooperate with 168, ask how many of them each make.

A, B, C, and D bought 10 loaves of bread and ate them separately. After eating, A paid for 6 loaves of bread, B and C took 2 loaves of bread, and D did not bring any money.

A three-digit number, abc, is not zero, write it again, it becomes a six-digit number like abcabc, which such six-digit number, is not a multiple of 7 and 11?

A, B and C process a batch of parts, it takes 10 days for A, B and C to do, 15 days for B and C to do, 20 days for A and C to do, how many days does it take for three people to do?

Acid out of this question in 3 seconds; 7+8 8+7 9+11 103+97 = how much.

1. The surface area of the cuboid = the surface area of the cube.

The area of one face of the cube = square decimeters.

Answer: The area of one face of this cube is decimeter squared.

Decimeter = 10 cm.

Large cube volume = 10 * 10 * 10 = 1000 cubic centimeters.

Small cube volume = 1 * 1 * 1 = 1 cubic centimeter.

1000 1 = 1000.

1000*1=1000 cm.

A: It can be divided into 1000 small cubes with an edge length of 1 cm, and can be placed 1000 cm long.

The surface area of the box and the cube is equal. That is, 27*2=56 is the surface area of the cuboid and the cube. The cube has 6 faces, so 56 6 is the area of one face.

A square with an edge length of 1 decimeter has a volume of 1 cubic decimeter, and a cube with an edge length of 1 cm has a volume of 1 cubic centimeter. 1 cubic decimeter = 1000 cubic centimeters, so it can be 1000 centimeters long.

First 50 + 80 = 130 tons, this is the amount of transported, then take 130 divided by 200 equals, and then the fraction is 13/20

Finally, A: A total of 13/20 of the pile of yellow sand was transported twice

50 + 80 = 130 (tons) 130/200 about the next = 13/20.

It's not difficult, 50 + 80 = 130 tons (the first and second transport).

Then 132 200 = 13/20 (total = total of two runs).

(50+80) divided by 200 equals thirteen twentieths.

(50+80)÷200=13/20

So a total of 13 20 of this pile of yellow sand were transported twice

At the time of the encounter, A has more lines than B: 12 2 = 24 km.

More lines per hour than B: 85-80 = 5 km.

Encounter time: 24 5 = hours.

Distance between the two places: (85+80) km.

The unit price of the former = yuan;

The unit price of the latter = yuan.

So the latter is cheaper.

Good luck with your studies.

The unit price of the former = yuan;

The unit price of the latter = yuan.

So the latter is cheaper.

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Good luck with your studies.

abc=xyz-zyx=(x-z)*100+(y-y)10+z-xbecause x>z

So x-z>0

z-x<0

So the number is constructed as a multiple of 100 minus a single digit.

So. a=x-z-1

b=9c=10+z-x

This gives the expressions a, b, c, and the fact that these symbols are integers from 0 to 9.

Calculate the CBA.

abc=xyz-zyx=(x-z-1)9(10+z-x)abc=(x-z-1)9(10+z-x)

cba=(10+z-x)9(x-z-1)

abc+cba=1089

The third floor is a correct solution.

In fact, xyz is arbitrary, and it can be assumed that xyz=321, then.

abc=321-123=198

abc+cba=198+891=1089

This is 5 years old?? I didn't have any really difficult questions in my first year of junior high school.

High school questions are not so difficult.

If you take 1 digit to the left, it will be reduced by 10 times, and the number of 1-1 10 = 9 10 will correspond to the amount rate. Amount:

Rate: 9 10

The original decimal is:

To the left, it becomes the original 1 10, and if the original number is 10x, then the displacement is x

That is, 10x-x=, then 9x=, x=, then the original number is 10x=

Let this number be x

If the decimal point is moved one place to the left, it becomes 10x (e.g. x-10x=x=).