先化简,再求值:(2a+6)/(a2-4a+4)×(a-2)/(a2+3a)-(1/a-2),其中a=1/3
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![先化简,再求值:(2a+6)/(a2-4a+4)×(a-2)/(a2+3a)-(1/a-2),其中a=1/3](/uploads/image/z/2640021-69-1.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%3A%282a%2B6%29%2F%28a2-4a%2B4%29%C3%97%28a-2%29%2F%28a2%2B3a%29-%281%2Fa-2%29%2C%E5%85%B6%E4%B8%ADa%3D1%2F3)
先化简,再求值:(2a+6)/(a2-4a+4)×(a-2)/(a2+3a)-(1/a-2),其中a=1/3
先化简,再求值:(2a+6)/(a2-4a+4)×(a-2)/(a2+3a)-(1/a-2),其中a=1/3
先化简,再求值:(2a+6)/(a2-4a+4)×(a-2)/(a2+3a)-(1/a-2),其中a=1/3
(2a+6)/(a2-4a+4)×(a-2)/(a2+3a)-(1/a-2)
=2(a+3)/(a-2)² × (a-2)/[a(a+3)] - 1/(a-2)
=2/[a(a-2)] - 1/(a-2)
=(2-a)/[a(a-2)]
=-1/a
=-1÷(1/3)
=-3