计算:(x^2y+xy^2)/(x+y);(4a^2-12ab+9b^2)/(3b-2a);(4x^2-6x^2y)/(2-3y);[(x+3y)^2-4x^2]/(x+y).
问题描述:
计算:(x^2y+xy^2)/(x+y);(4a^2-12ab+9b^2)/(3b-2a);(4x^2-6x^2y)/(2-3y);[(x+3y)^2-4x^2]/(x+y).
要有计算过程
答
xy;-2a+3b;2x^2y;-3x+9