(x²-7x)-(3x²-5-7x)化简(4ab-b²)-2(a²+2ab-b²)化简

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(x²-7x)-(3x²-5-7x)化简(4ab-b²)-2(a²+2ab-b²)化简

(x²-7x)-(3x²-5-7x)化简(4ab-b²)-2(a²+2ab-b²)化简
(x²-7x)-(3x²-5-7x)化简
(4ab-b²)-2(a²+2ab-b²)化简

(x²-7x)-(3x²-5-7x)化简(4ab-b²)-2(a²+2ab-b²)化简
(x²-7x)-(3x²-5-7x)
=x²-7x-3x²+5+7x
=-2x²+5
(4ab-b²)-2(a²+2ab-b²)
=4ab-b²-2a²-4ab+2b²
=-2a²+b²