How to calculate 4Y (Y-X) square-6y (X-Y) cube

How to calculate 4Y (Y-X) square-6y (X-Y) cube

4Y (Y-X) square-6y (X-Y) cube
=4y(x²-2xy+y²)-6y(x³-3x²y+3xy²-y³）
=4x²y-8xy²+4y³-6x³y+18x²y²-18xy³+6y^4

(A-1 / 2 of the square of A-A) divided by (1-A + 1 / 1)

(2 + A-1 / 1-A + 1 / 1) divided by (a-1-a / 2)
=[2+1/(a-1)-1/(a+1)]÷a[1-1/(1-a²)]
=[2+1/(a-1)-1/(a+1)]÷a÷[(1-a²)/(1-a²)-1/(1-a²)]
=[2+1/(a-1)-1/(a+1)]÷a÷[(-a²)/(1-a²)]
=[2+1/(a-1)-1/(a+1)]÷a÷a²/(a²-1)
=[2+1/(a-1)-1/(a+1)]÷a³×(a²-1)
=[2(a²-1)+(a+1)-(a-1)]÷a³
=(2a²-2+a+1-a+1)÷a³
=2a²÷a³
=2/a

(a + 2) 1-1 divided by (a + 2) 2-1

The original formula = (1-a-2) / (a + 2) × (a + 2) / (A & # 178; - 1)
=-(a+1)/(a+2)×(a+2)/(a+1)(a-1)
=-1/(a-1)