数学问题-2m-3n)(3n-2m)等于多少?

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数学问题-2m-3n)(3n-2m)等于多少?数学问题-2m-3n)(3n-2m)等于多少?数学问题-2m-3n)(3n-2m)等于多少?(-2m-3n)(3n-2m)=-(3n+2m)(3n-2m)

数学问题-2m-3n)(3n-2m)等于多少?
数学问题-2m-3n)(3n-2m)等于多少?

数学问题-2m-3n)(3n-2m)等于多少?
(-2m-3n)(3n-2m)
= - (3n+2m)(3n-2m)
= - 9n^2+4m^2

-(2m-3n)(3n-2m)=(3n-2m)^2

原式=(-2m)²-(3n)²=4m²-9n²

4m-9n