化简(a+b+c)²-(a-b+c)²的结果为
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![化简(a+b+c)²-(a-b+c)²的结果为](/uploads/image/z/3709889-17-9.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%88a%2Bb%2Bc%EF%BC%89%26%23178%3B-%EF%BC%88a-b%2Bc%EF%BC%89%26%23178%3B%E7%9A%84%E7%BB%93%E6%9E%9C%E4%B8%BA)
化简(a+b+c)²-(a-b+c)²的结果为
化简(a+b+c)²-(a-b+c)²的结果为
化简(a+b+c)²-(a-b+c)²的结果为
原式=[(a+b+c)+(a-b+c)][(a+b+c)-(a-b+c)]
=(2a+2c)*2b
=4ab+2bc
=[(a+b+c)+(a-b+c)][(a+b+c)-(a-b+c)]
=(2a+2c)×2b
=4ab+4bc
原式=a^2+b^2+c^2+2ab+2bc+2ac-(a^2+b^2+c^2-2ab-2bc+2ac)
=a^2+b^2+c^2+2ab+2bc+2ac-a^2-b^2-c^2+2ab+2bc-2ac
=4ab+4bc