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先化简,再求值:(a²+a)(a²-5a+6)分之(2a-a²)(a²+4a+3),其中a=4
人气:294 ℃ 时间:2019-08-19 13:36:48
解答
(a²+a)(a²-5a+6)分之(2a-a²)(a²+4a+3)
=(2a-a²)(a²+4a+3)/(a²+a)(a²-5a+6)
=a(2-a)(a+3)(a+1)/a(a+1)(a-3)(a-2)
=-(a+3)/(a-3)
a=4
上式=-(4+3)/(4-3)
=-7
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