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karkushaStepashka

Пошаговое объяснение:

1) (5а+7в)²-70ав= 25а²+49в²+70ав-70ав= 25а²+49в².

2) (8а-в)-64а²= 64а²-16ав+в²-64а²= в²-16ав.

3) (х-8)²-2х(6-х)²= х²-16х+64-2х(36-12х+х²)= х²-16х+64-64х+24х²-2х³=-2х³+25х²-80х+64.

4) (с+7)с-(1-с)²= с²+7с-(1-2с+с²)= с²+7с-1+2с-с²= 9с-1.

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