化简求值：【a-2/（a2+2a）-a-1/（a2+4a+4】÷a-4/a+2,其中a=-12
人气：332 ℃ 时间：2020-03-29 07:25:02
解答
[(a-2)/(a^2+2a)-(a-1)/(a^2+4a+4)]÷(a-4)/(a+2)=[(a-2)/a(a+2)-(a-1)/(a+2)^2]÷(a-4)/(a+2)=[(a-2)/a(a+2)-(a-1)/(a+2)^2]*(a+2)/(a-4)=(a-2)/a(a+2)*(a+2)/(a-4)-(a-1)/(a+2)^2*(a+2)/(a-4)=(a-2)/a(a-4)-(a-1)/...
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