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先化简,再求值:(a/a-2)-(2a/a²-2a)-2/a,其中a=3/2.
人气:230 ℃ 时间:2020-03-24 23:43:20
解答
原式=(a²-2a-2a+4)/a(a-2)
=(a²-4a+4)/a(a-2)
=(a-2)²/a(a-2)
=(a-2)/a
=(3/2-2)/(3/2)
=-1/2*2/3
=-1/3
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