Sprowadź podane wyrażenia do najprostszej postaci: a). -y(x-1) + (2xy-y) - x(y+1) b). (-3x³y² + 5x²y² - 2xy²) ÷ xy² c). (x-2y) + (4x+2-3y) -(-5y-2+5x)

a). -y(x-1) + (2xy-y) - x(y+1)=-xy+y+2xy-y-xy-x=-x b). (-3x³y² + 5x²y² - 2xy²) ÷ xy²=-3x²+5x-2 c). (x-2y) + (4x+2-3y) -(-5y-2+5x) =x-2y+4x+2-3y+5y+2-5x=4 proszę:)

a) -y(x-1)+(2xy-y)-x(y+1)=-xy+y+2xy-y-xy-x=-x b) (-3x³y²+5x²y²-2xy²)/(xy²)=(-3x³y²)/(xy²)+(5x²y²)/(xy²)+ +(-2xy²)/(xy²)=-3x²+5x-2 c) (x-2y)+(4x+2-3y)-(-5y-2+5x)=x-2y+4x+2-3y+5y+2-5x=4