(m^2+2mn+n^2)/4-mn=(m^2-2mn+n^2)/4 你写的貌似错了
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![(m^2+2mn+n^2)/4-mn=(m^2-2mn+n^2)/4 你写的貌似错了](/uploads/image/z/8669221-61-1.jpg?t=%28m%5E2%2B2mn%2Bn%5E2%29%2F4-mn%3D%28m%5E2-2mn%2Bn%5E2%29%2F4+%E4%BD%A0%E5%86%99%E7%9A%84%E8%B2%8C%E4%BC%BC%E9%94%99%E4%BA%86)
(m^2+2mn+n^2)/4-mn=(m^2-2mn+n^2)/4 你写的貌似错了
(m^2+2mn+n^2)/4-mn=(m^2-2mn+n^2)/4 你写的貌似错了
(m^2+2mn+n^2)/4-mn=(m^2-2mn+n^2)/4 你写的貌似错了
(m^2+2mn+n^2)/4-mn=m^2/4+mn/2+n^2/4-mn =m^2/4-mn/2+n^2/4==(m^2-2mn+n^2)/4
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