[a-(2ab-b²)/a]为什么化简后-b²变成+b²原式(a-b)/a÷[a-(2ab-b²)/a]=(a-b)/a÷[(a²-2ab+b²)/a]=(a-b)÷(a-b)²=1/(a-b)知道了 == 负变号
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![[a-(2ab-b²)/a]为什么化简后-b²变成+b²原式(a-b)/a÷[a-(2ab-b²)/a]=(a-b)/a÷[(a²-2ab+b²)/a]=(a-b)÷(a-b)²=1/(a-b)知道了 == 负变号](/uploads/image/z/4331370-66-0.jpg?t=%5Ba-%EF%BC%882ab-b%26%23178%3B%EF%BC%89%2Fa%5D%E4%B8%BA%E4%BB%80%E4%B9%88%E5%8C%96%E7%AE%80%E5%90%8E-b%26%23178%3B%E5%8F%98%E6%88%90%2Bb%26%23178%3B%E5%8E%9F%E5%BC%8F%EF%BC%88a-b%EF%BC%89%2Fa%C3%B7%5Ba-%EF%BC%882ab-b%26%23178%3B%EF%BC%89%2Fa%5D%3D%EF%BC%88a-b%EF%BC%89%2Fa%C3%B7%5B%EF%BC%88a%26%23178%3B-2ab%2Bb%26%23178%3B%EF%BC%89%2Fa%5D%3D%EF%BC%88a-b%EF%BC%89%C3%B7%EF%BC%88a-b%29%26%23178%3B%3D1%2F%28a-b%29%E7%9F%A5%E9%81%93%E4%BA%86+%3D%3D+%E8%B4%9F%E5%8F%98%E5%8F%B7)
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[a-(2ab-b²)/a]为什么化简后-b²变成+b²原式(a-b)/a÷[a-(2ab-b²)/a]=(a-b)/a÷[(a²-2ab+b²)/a]=(a-b)÷(a-b)²=1/(a-b)知道了 == 负变号
[a-(2ab-b²)/a]为什么化简后-b²变成+b²
原式(a-b)/a÷[a-(2ab-b²)/a]
=(a-b)/a÷[(a²-2ab+b²)/a]
=(a-b)÷(a-b)²
=1/(a-b)
知道了 == 负变号
[a-(2ab-b²)/a]为什么化简后-b²变成+b²原式(a-b)/a÷[a-(2ab-b²)/a]=(a-b)/a÷[(a²-2ab+b²)/a]=(a-b)÷(a-b)²=1/(a-b)知道了 == 负变号
通分呀
a-(2ab-b²)/a
=a²/a-(2ab-b²)/a
=[(a²-(2ab-b²)]/a
=(a²-2ab+b²)/a
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