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约分:2xy-4y/x-2 a²-ab/a²-b² x²-9/9-6x+x²
4-8b/4b²-1
化简:
(x+y)²/x²-y平方
(1)2xy-4y/x-2
(2)a²-ab/a²-b²
(3)x²-9/9-6x+x²
人气:467 ℃ 时间:2020-03-18 00:33:24
解答
2xy-4y/x-2 =2y(x-2)/(x-2)=2ya²-ab/a²-b²=a(a-b)/(a+b)(a-b)=a/a+bx²-9/9-6x+x²=(x+3)(x-3)/(x-3)²=x+3/x-34-8b/4b²-1=4(1-2b)/(2b+1)(2b-1)= -4(2b-1)/(2b+1)(2b-1)= -4/2b+1(...
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