2. Плиииз...

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Упростите выражение (a-2ab)(a^2+2ab+4b^2)-a(a-b)(a+b) и найдите его значение при a=8 и b=-1/2. Плиииз

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yarovoe (a-2ab)(a^2+2ab+4b^2)-a(a-b)(a+b) =a(1-2b)(a²+2ab+4b²-a²+b²)=
=a(1-2b)(2ab+5b²)=ab(1-2b)(2a+5b)
ab ·(1-2b)(2a+5b)=8·(-0,5)·(1-2·(-0,5)(2·8+5·(-0,5))=-4·2·(16-2,5)=
=-8·13,5=-108

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