Question

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Answer 1

Ответ:

Объяснение:

a) x²-81 = x²-9² = (x+9)(x-9)

б) 49x²-4y² = (7x)²-(2y)² = (7x+2y)(7x-2y)

в) x²-18x+81 = x²-2*9x+9² = (x-9)(x-9)

г) y³-4y = y(y²-4) = y(y²-2²) = y(y+2)(y-2)

д) x³-y³+x²y-xy² = (x³+x²y) - (y³+xy²) = x²(x+y) - y²(x+y) = (x+y)(x²-y²) = (x+y)(x+y)(x-y)

е) x^18-4x^9+4 = (x^9)²-2*2x^9+2² = (x^9-2)(x^9-2)