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a-1/a平方-4a+4÷2a-2/a平方-4
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人气:176 ℃ 时间:2020-04-08 19:16:37
解答
=(a-1)/(a-2)² ÷2(a-1)/(a+2)(a-2)
=(a-1)/(a-2)² ×(a+2)(a-2)/2(a-1)
=(a+2)/2(a-2)
=(a+2)/(2a-4)
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