Question

пожалусто нужна помощь​

Answer 1

Ответ:

Объяснение:

2.

a)y³-4y=y(y²-2²)=y(y-2)(y+2)

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

=(x-y)(x²+xy+y²+xy)=(x-y)(x²+y²+2xy)=(x-y)(x+y)²=(x-y)(x+y)(x+y)

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

3)

a)(x²-8x+16=(x-4)²

(x-4)²=(504-4)²=500²=250000      pri   x=504

b)x²+y²=(x+y)²-2xy

(x+y)²-2xy=15-2*8=15-16=-1      pri x+y=15  ;  xy=8