计算(-3m+n-p)(3m-n-p)
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计算(-3m+n-p)(3m-n-p)计算(-3m+n-p)(3m-n-p)计算(-3m+n-p)(3m-n-p)(3m-n-p)(3m+n-P)=[(3m-p)-n][(3m-P)+n]=(3m-p
计算(-3m+n-p)(3m-n-p)
计算(-3m+n-p)(3m-n-p)
计算(-3m+n-p)(3m-n-p)
(3m-n-p)(3m+n-P)
=[(3m-p)-n][(3m-P)+n]
=(3m-p)^2-n^2
=9m^2-6mp+p^2-n^2
原式=-(3m-n+p)(3m-n-p)
=-【(3m-n)+p】【(3m-n)-p】
=-【(3m-n)²-p²】
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