先化简(a²-4/a²-4a+4 - 2/a-2)÷a²+2a/a-2,再对a取一个你喜欢的数代入求值
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![先化简(a²-4/a²-4a+4 - 2/a-2)÷a²+2a/a-2,再对a取一个你喜欢的数代入求值](/uploads/image/z/2580005-29-5.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%EF%BC%88a%26%23178%3B-4%2Fa%26%23178%3B-4a%2B4+-+2%2Fa-2%EF%BC%89%C3%B7a%26%23178%3B%2B2a%2Fa-2%2C%E5%86%8D%E5%AF%B9a%E5%8F%96%E4%B8%80%E4%B8%AA%E4%BD%A0%E5%96%9C%E6%AC%A2%E7%9A%84%E6%95%B0%E4%BB%A3%E5%85%A5%E6%B1%82%E5%80%BC)
先化简(a²-4/a²-4a+4 - 2/a-2)÷a²+2a/a-2,再对a取一个你喜欢的数代入求值
先化简(a²-4/a²-4a+4 - 2/a-2)÷a²+2a/a-2,再对a取一个你喜欢的数代入求值
先化简(a²-4/a²-4a+4 - 2/a-2)÷a²+2a/a-2,再对a取一个你喜欢的数代入求值
(a²-4/a²-4a+4 - 2/a-2)÷a²+2a/a-2
=[(a+2)(a-2)/(a-2)²-2/(a-2)]×(a-2)/a(a+2)
=[(a+2)/(a-2)-2/(a-2)]×(a-2)/a(a+2)
=a/(a-2)×(a-2)/a(a+2)
=1/(a+2)
当a=1,
原式=1/(a+2)=1/3