计算若(3x+2y)(2x+3y)-(x-3y)(3x+4y)
问题描述:
计算若(3x+2y)(2x+3y)-(x-3y)(3x+4y)
答
(3x+2y)*(2x+3y) -(x-3y)*(3x+4y)
=6x^2 +13xy +6y^2 -3x^2+5xy +12y^2
=3x^2+18xy +18y^2