先化简,再求值:(a²+1/a-2)÷(a+2)(a-1)/a²+2a,其中a²-4=0.先化简,再求值:(a²+1/a -2)÷(a+2)(a-1)/(a²+2a),其中a²-4=0.
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![先化简,再求值:(a²+1/a-2)÷(a+2)(a-1)/a²+2a,其中a²-4=0.先化简,再求值:(a²+1/a -2)÷(a+2)(a-1)/(a²+2a),其中a²-4=0.](/uploads/image/z/765304-16-4.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%88a%26%23178%3B%2B1%2Fa-2%29%C3%B7%EF%BC%88a%2B2%29%28a-1%29%2Fa%26%23178%3B%2B2a%2C%E5%85%B6%E4%B8%ADa%26%23178%3B-4%3D0.%E5%85%88%E5%8C%96%E7%AE%80%EF%BC%8C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%88a%26%23178%3B%2B1%2Fa+-2%29%C3%B7%EF%BC%88a%2B2%29%28a-1%29%2F%EF%BC%88a%26%23178%3B%2B2a%EF%BC%89%EF%BC%8C%E5%85%B6%E4%B8%ADa%26%23178%3B-4%3D0.)
先化简,再求值:(a²+1/a-2)÷(a+2)(a-1)/a²+2a,其中a²-4=0.先化简,再求值:(a²+1/a -2)÷(a+2)(a-1)/(a²+2a),其中a²-4=0.
先化简,再求值:(a²+1/a-2)÷(a+2)(a-1)/a²+2a,其中a²-4=0.
先化简,再求值:(a²+1/a -2)÷(a+2)(a-1)/(a²+2a),其中a²-4=0.
先化简,再求值:(a²+1/a-2)÷(a+2)(a-1)/a²+2a,其中a²-4=0.先化简,再求值:(a²+1/a -2)÷(a+2)(a-1)/(a²+2a),其中a²-4=0.
题目不对
因为a²-4=0则a=±2
但a+2和a-2i分母
则a≠±2
所以无解
你好
(a²+1/a -2)÷(a+2)(a-1)/(a²+2a)
=(a²+1/a -2)÷(a+2)(a-1)/a(a+2)
=(a²+1/a -2)×a/(a-1)
=(a³+1-2a)/(a-1)
=(a³-a²+a²+1-2a)/(a-1)
=...
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你好
(a²+1/a -2)÷(a+2)(a-1)/(a²+2a)
=(a²+1/a -2)÷(a+2)(a-1)/a(a+2)
=(a²+1/a -2)×a/(a-1)
=(a³+1-2a)/(a-1)
=(a³-a²+a²+1-2a)/(a-1)
=[a²(a-1)+(a-1)²]/(a-1)
=a²+(a-1)
a+2≠0
a≠-2
a²-4=0
所以a=2
原式=2²+(2-1)=5
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