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数学
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化简a-b/a+2b÷a^2-b^2/a^2+4ab+4b^2-1
人气:237 ℃ 时间:2020-02-05 21:27:18
解答
原式=[(a-b)/(a+2b)]×[(a+2b)^2/(a+b)(a-b)]-1
=(a+2b)/(a+b)-1
=(a+2b-a-b)/(a+b)
=b/(a+b)
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