3y/（2x+2y）+2xy/（x^2+xy）
问题描述：
3y/（2x+2y）+2xy/（x^2+xy）
答
3y/(2x+2y)+2xy/(x^2+xy)=3y/[2(x+y)] + 2y/(x+y)]=(3y+4y)/[2(x+y)] =7y/[2(x+y)]
3y/（2x+2y）+2xy/（x^2+xy）
3y/(2x+2y)+2xy/(x^2+xy)=3y/[2(x+y)] + 2y/(x+y)]=(3y+4y)/[2(x+y)] =7y/[2(x+y)]