计算 m^2-(-mn+n^2)+(-m^2-2mn+n^2)
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计算m^2-(-mn+n^2)+(-m^2-2mn+n^2)计算m^2-(-mn+n^2)+(-m^2-2mn+n^2)计算m^2-(-mn+n^2)+(-m^2-2mn+n^2)
计算 m^2-(-mn+n^2)+(-m^2-2mn+n^2)
计算 m^2-(-mn+n^2)+(-m^2-2mn+n^2)
计算 m^2-(-mn+n^2)+(-m^2-2mn+n^2)
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