Упростите 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+1)-(x-y)^2x

x(x+2y)-y(2x-1)x²+2xy-y(2x-1)x²+2xy-(2xy-y)x²2+2xy-2xy+yx²+yx^2(x+2y)-y(2x^2+1)x³+2x²y-y(2x²+1)x³+2x²y-(2x²y+y)x³+2x²y-2x²y-yx³-y(x-y)²(x+1)-(x-y)²x(x²-2xy+y²)(x+1)-(x-y)²xx³+x²-2x²y-2xy+y²x+y²-(x-y)²xx³+x²-2x²y-2xy+y²x+y²-(x²-2xy+y²)xx³+x²-2x²y-2xy+y²x+y²-(x³-2x²y+y²x)x³+x²-2x²y-2xy+y²x+y²-x³+2x²y-y²xx²-2x²y-2xy+y²x+y²+2x²y-y²xx²-2xy+y²x+y²-y²xx²-2xy+y²7m(m-n)-3n(n+m)7m²-7nm-3n(n+m)7m²-7nm-(3n+3m)n7m²-7nm-(3n²+3mn)7m²-7nm-3n²-3mn7m²-10nm-3n²