Выражение: в) 7m(m-n)-3n(n+m) д) x(x+2y)-y(2x-1) ж)x^2(x+2y)-y(2x^2+1) и) (x-y)^2(x+-y)^2x

x(x+2y)-y(2x-1)
x²+2xy-y(2x-1)
x²+2xy-(2xy-y)
x²2+2xy-2xy+y
x²+y

x^2(x+2y)-y(2x^2+1)
x³+2x²y-y(2x²+1)
x³+2x²y-(2x²y+y)
x³+2x²y-2x²y-y
x³-y

(x-y)²(x+1)-(x-y)²x
(x²-2xy+y²)(x+1)-(x-y)²x
x³+x²-2x²y-2xy+y²x+y²-(x-y)²x
x³+x²-2x²y-2xy+y²x+y²-(x²-2xy+y²)x
x³+x²-2x²y-2xy+y²x+y²-(x³-2x²y+y²x)
x³+x²-2x²y-2xy+y²x+y²-x³+2x²y-y²x
x²-2x²y-2xy+y²x+y²+2x²y-y²x
x²-2xy+y²x+y²-y²x
x²-2xy+y²

7m(m-n)-3n(n+m)
7m²-7nm-3n(n+m)
7m²-7nm-(3n+3m)n
7m²-7nm-(3n²+3mn)
7m²-7nm-3n²-3mn
7m²-10nm-3n²