Three quarters, seven eighths, 0000, 23456789 pumps

Three quarters -- morning and evening;
Seven eighths
0000 -- absolutely safe
23456789 -- lack of clothing (1) eat less (10)
Pump

How to express 100 yuan per square meter per month? Is it 100 yuan / month / square meter or 100 yuan / month * square meter?
Originally, I thought it was the former, but some people said it was the latter. They said that before the square meter, the division sign of '/' would make the square meter a divisor. If we use * to divide the square meter under the semicolon, is it reasonable? What is it? Or is there any other correct way to write it?

Is the former, or use 100 yuan / (month * square meter), the so-called "every" is the denominator

3 -1
×
1 1
A coefficient 3-1 = 2
So the original formula = (3a-1) (a + 1)

15x²-7xy-4y²=(5x-4y)(3x+y)

Because the value of 2yxy + 3Y is 10, - 6yxy-9y + 7 = - 3 (2yxy + 3Y) + 7 = - 3x10 + 7 = - 30 + 7 = - 23

Original formula = (x-2y) (x + y) + [2x (2x + 2Y) + 2XY] - 6x (x + y)
=(x-2y+4x-6x)(x+y)+2xy=-(x+2y)(x+y)+2xy=-(-1+2*2)(-1+2)+2*(-1)*2=-3-4=-7；

1、2（0.3X+4）-5（0.2x-7）=9 2*0.3X+2*4-5*0.2X+5*7 =9 0.6X+8-X+35=9 -0.4X=-43+9 X=852、2（3y-4）+7（4...

The original formula is 4 [(- 3Y) & sup2; - (3 / 2x) & sup2;] = 4 [9y & sup2; - 9 / 4x & sup2;] = 36Y & sup2; - 9x & sup2;

(-4x^6-20x^4y^2-12x^3y+6x^3y^2)/[-(-2x)^3]=(-2*2x^6-10*2x^4y^2-6*2x^3y+3*2x^3y^2)/(2x)^3=-2x^3-10xy^2-6y+3y^2

10-3(2x-y)=10-3x3=1