(2m+1/3n)^2 计算
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(2m+1/3n)^2计算(2m+1/3n)^2计算(2m+1/3n)^2计算(2m+1/3n)^2=4m^2+4/3mn+1/9n^2
(2m+1/3n)^2 计算
(2m+1/3n)^2 计算
(2m+1/3n)^2 计算
(2m+1/3n)^2
=4m^2+4/3mn+1/9n^2
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