[(x+y)乘(x-y)]乘3x等于多少[3(x+y)+2(x-y)]3x化简后结果是什么

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[(x+y)乘(x-y)]乘3x等于多少[3(x+y)+2(x-y)]3x化简后结果是什么[(x+y)乘(x-y)]乘3x等于多少[3(x+y)+2(x-y)]3x化简后结果是什么[(x+y)乘(x-

[(x+y)乘(x-y)]乘3x等于多少[3(x+y)+2(x-y)]3x化简后结果是什么
[(x+y)乘(x-y)]乘3x等于多少
[3(x+y)+2(x-y)]3x化简后结果是什么

[(x+y)乘(x-y)]乘3x等于多少[3(x+y)+2(x-y)]3x化简后结果是什么
5X-1Y

3x^3-3xy^2
[3(x+y)+2(x-y)]3x=(3x+3y+2x-2y)3x=(5x+y)3x=15x^2+3xy

(x+y)*(x-y)=x^2-y^2 (平方差公式)
(x^2-y^2)*3x=3x^3-3xy^2