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先化简1减a分之a-1除a方+2a分之a方-1
人气:107 ℃ 时间:2020-10-01 20:51:38
解答
1减a分之a-1除a方+2a分之a方-1
=1-(a-1)/a÷(a²-1)/(a²+2a)
=1-(a-1)/a×a(a+2)/(a-1)(a+1)
=1-(a+2)/(a+1)
=(a+1-a-2)/(a+1)
=-1/(a+1)
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