化简 -3(n^2-2m^2n^2) 化简-3(n^2-2m^2n^2)
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化简-3(n^2-2m^2n^2)化简-3(n^2-2m^2n^2)化简-3(n^2-2m^2n^2)化简-3(n^2-2m^2n^2)化简-3(n^2-2m^2n^2)化简-3(n^2-2m^2n^
化简 -3(n^2-2m^2n^2) 化简-3(n^2-2m^2n^2)
化简 -3(n^2-2m^2n^2)
化简
-3(n^2-2m^2n^2)
化简 -3(n^2-2m^2n^2) 化简-3(n^2-2m^2n^2)
-3n平方+6m平方n平方
应该是-7nπ
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