计算: (1)4/x-2-x+2 (2)1-(a-b/a+2b)÷(a²-b²/a²+4ab+4b²)

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计算:(1)4/x-2-x+2(2)1-(a-b/a+2b)÷(a²-b²/a²+4ab+4b²)计算:(1)4/x-2-x+2(2)1-(a-b/a+2b)÷

计算: (1)4/x-2-x+2 (2)1-(a-b/a+2b)÷(a²-b²/a²+4ab+4b²)
计算: (1)4/x-2-x+2 (2)1-(a-b/a+2b)÷(a²-b²/a²+4ab+4b²)

计算: (1)4/x-2-x+2 (2)1-(a-b/a+2b)÷(a²-b²/a²+4ab+4b²)
(1)=[4-(x-2)²]/(x-2)=(4x-x²)/(x-2)=x(4-x)/(x-2)
(2)=1-(a-b/a+2b)×[(a+2b)²/(a-b)(a+b)]
=1-(a+2b)/(a+b)
=(a+b-a-2b)/(a+b)
=-b/(a+b)