A few simple math problems Who knows?

50 meters.

50 Ben Answer Supplement 60 (1+20%) = 50 The average of the first number and the fifth number is the third number, so there is 18 (3 7) = 42, which is the third number, so the first number is 40

If class B takes x, then (200+x) (200-x)=150%, so x=40

Class B took 40 copies.

I'm sorry I made a mistake just now, but now I'm correcting it.

1.20% more than (50) meters is 60 meters?

2.Increase the base and height of a triangle by 1 4, and increase the area (?)

3.Five consecutive natural numbers, the third of which is the first.

4 7 more than 18 in the average of the number of one and five, and the first (minimum) natural number is (40)?

4.Class A and Class B each have 200 storybooks, and after Class A gives Class B (100) books, Class B has 50% more storybooks than Class A?

There is also a recursive equation calculation.

Answer: The book of the Storybook in Class B is 50% more than that of Class A, is it 50% of Class B or 50% of Class Nails??

60 divided by (1+20%) 50

1+1 4)(1+1 4) divided by 2-1*1 divided by 2} divided by (1*1 divided by 2)=

Let the five numbers be x-2 x-1 x x+1 x+2 according to the title x-18= x*4 7 x=42

200-(200+200) divided by (1+1+50%) = 200-160=40

138 and 138 139

Answer supplement I can be sure that my first four questions must be correct.

3 The third number of 3 7 = 18, so the third number is 42, and the first number is 40

Root. 5 I don't understand what it means.

This answer supplement is the third question 40

1: root number 4a-2 = 2 times the root number 2a-1, so 1+a=2a-1, a=22: the cubic of x +2x -7=x(x +2x)-7=x(x +x+x)-7; Since x +x-1=0, x +x=1 is substituted for x(x +x+x)-7=x(1+x)-7=x +x-7=1-7=-6

The solution of 3: x -6x+8=0 is 4 and 2, then the triangle is an isosceles triangle, and the sum of the two sides must be greater than the third side, so the two long sides are 4, the short side is 2, and the circumference is 4+4+2=10

I don't know if it's right or not, I hope it can help you.

(1) Recruit 50 people A and 100 people B, using linear programming.

2) 39 people, 15 albums. Establish a system of binary linear equations.

3) The time is too short, and you will be given a solution later.

This math problem can be used to calculate the known smallest unit price:

50ml of cream is 315 yuan, then 1ml of cream is (315 50) yuan.

7ml cream is 7 315 50 yuan.

Because 50 ml of cream 315

So 315 50, 1 ml of cream.

When the cream is 7 ml.

So the answer is.