Пошаговое объяснение:
1) (x²+2xy+y²)(x+y)-(x²-2xy+y²)(x-y)-6x²y+6y³=8y³
(x³+x²y+2x²y+2xy²+xy²+y³)-(x³-x²y-2x²y+2xy²+xy²-y³)-6x²y+6y³=8y³
x³+3x²y+3xy²+y³-x³+3x²y-3xy²+y³-6x²y+6y³=8y³
8y³=8y³
Пошаговое объяснение:
1) (x²+2xy+y²)(x+y)-(x²-2xy+y²)(x-y)-6x²y+6y³=8y³
(x³+x²y+2x²y+2xy²+xy²+y³)-(x³-x²y-2x²y+2xy²+xy²-y³)-6x²y+6y³=8y³
x³+3x²y+3xy²+y³-x³+3x²y-3xy²+y³-6x²y+6y³=8y³
8y³=8y³