(1)m的平方-(m+2)(m-3);(2)(a-b)的平方+b(2a+b)(3);(x-3y)(y+3x)-(x-3y)(3y-x)

问题描述:

(1)m的平方-(m+2)(m-3);(2)(a-b)的平方+b(2a+b)(3);(x-3y)(y+3x)-(x-3y)(3y-x)
(4)(2x-y+3)(2x+y-3)

1)m²-(m+2)(m-3)=m²-(m²-m-6)=m²-m²+m-6=m-62)(a-b)²+b(2a+b)=a²-2ab+b²+2ab+b²=a²+2b²3)(x-3y)(y+3x)-(x-3y)(3y-x)=(xy+3x²-3y²...