因式分解(2m-3n)^2-(2m+3n)(2m-3n)+(2m+3n)^2
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因式分解(2m-3n)^2-(2m+3n)(2m-3n)+(2m+3n)^2因式分解(2m-3n)^2-(2m+3n)(2m-3n)+(2m+3n)^2因式分解(2m-3n)^2-(2m+3n)(2m
因式分解(2m-3n)^2-(2m+3n)(2m-3n)+(2m+3n)^2
因式分解(2m-3n)^2-(2m+3n)(2m-3n)+(2m+3n)^2
因式分解(2m-3n)^2-(2m+3n)(2m-3n)+(2m+3n)^2
(2m-3n)^2-(2m+3n)(2m-3n)+(2m+3n)^2
=(2m-3n)^2-2(2m+3n)(2m-3n)+(2m+3n)^2+(2m+3n)(2m-3n)
=(2m-3n-2m-3n)^2+(2m+3n)(2m-3n)
=36n^2+4m^2-9n^2
=27n^2+4m^2
配方法、公式法
(2m-3n)^2-(2m+3n)(2m-3n)+(2m+3n)^2
=(2m-3n)^2-2(2m+3n)(2m-3n)+(2m+3n)^2+(2m+3n)(2m-3n)
=(2m-3n-2m-3n)^2+(2m+3n)(2m-3n)
=36n^2+4m^2-9n^2
=27n^2+4m^2
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