(分数线用/代替吧)通分:1.2x/x²+y²,y/(x+y)² 2.y/2(x-y),x/(y-x)² 3.1/a²-4,1/a²-4a+44.a+1/a²-2a+1,a/a²-a计算:1.(1+b/a) ÷ (1-b/a) 2.a²-b²/a-b ÷ (2+ a²+b²/ab) 3.(x/x
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