Mathematics, I don t understand! Math won t!

.01km=4010m

4010 5000= Length on the drawing.

Minute. 2. Perimeter c=2 r=

So radius r=

Area s = r =

Water storage 1570m, v=sh, so.

h = 1570 314 = 5m 5 m deep.

Surface area = S bottom + S side = 314+

With cement 942 * 13 = 12246 kg.

6 o'clock = (3) o'clock (36) minutes 80 square meters 20 square decimeters = (square meters.

4、.(3) (4) = (twelve) nine-tenths =: 20 = (75) 5, the supermarket engages in **, the ointment buys four get one free, and the actual discount is (eight).

6. The number A is the reciprocal of the number B, and the number B first expands it by 10 times, and then shrinks it by one hundredth, and the number A is (1 16).

7.In a rectangular piece of paper with a length of centimeters and a width of centimeters, it is possible to subtract (21) circles with a radius of 1 centimeter.

5.The supermarket engages in **, buy four free ointments, and actually get (8) off.

Categories: Education Exam >> Study Help.

Two piles of coal workers 315 tons, if you put 2 5 of the coal in pile A into pile B, then pile B coal is 4 times that of pile A, how many tons of coal are there in the two piles?

I hope to write down the analysis ideas as well, without being complicated)

Analysis: 1, the rope is divided into 3 parts, 1 4, 23 meters and half, indicating that 23 meters is the whole minus 1 4 and then halved that is, 1 4, the whole rope is 23 * 4 = 92 meters long;

2, A + B = 315, after moving B = 4 * A, then 5 * A = 315, then A = 63, B = 252;And at this time, the weight of A is the original (1-2 5) = 3 5, that is to say, A originally had 63 divided by 3 5, that is, 105 tons, then B originally had 315-105 = 210 tons.

1) After the discount, the total price of the house is: 80,000 * 76% = 60,800 (yuan bi sui).

2) The deed tax is: 60,800 * yuan).

A: After the discount, the total price of the house is 60,800 yuan, and the deed tax is 912 yuan.

1) After the discount, it will be 10,000 yuan.

2) The tax is 912 yuan.

What about math problems that I can't do?

Set the unit price of the plate x yuan and the unit price of the bowl y yuan.

10y+4x= ①

10y+6x= ②

2x=x=yuany=(yuan.

Good luck with your studies!

If you have any questions, please ask and be willing to answer them.

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The money that my aunt paid more than my mother was the money of (6-4) plates: (==Yuan.)

Bowl: (=10 10=1 yuan.)

Mom bought 10 bowls and 4 plates and paid a total of yuan, and my aunt also bought the same 10 bowls and 6 plates and paid a total of yuan, and my aunt bought 2 more plates than my mother.

Pay more so a plate. $8.

So the bowl is (yuan.

Unravel a plate of x-yuan.

6x-4x=

2x=x=a bowl: (yuan.

A: Unit price of the bowl B: Unit price of the plate.

10a+4b=

10a+6b=

b= a=1

Solve by equation method:

Set one plate for X yuan and one bowl for Y yuan.

10y 4x from the title

10y＋6x＝

Solve x y 1

Solve it with arithmetic:

Yuan) Yuan) This is the unit price of the plate.

yuan) 10 10 1 yuan.

This is the unit price of the bowl.

1 question 60 cm, 150 square centimeters, 125 cubic centimeters, 2 questions 180 liters.

Three questions: square decimeters, liters.

Four questions: 500 decimeters.

Five questions: 8 cubic centimeters, 72 cubic centimeters.