化简-3x²y+2x²y+3xy²-2xy²

问题描述:

化简-3x²y+2x²y+3xy²-2xy²

-3x²y+2x²y+3xy²-2xy² =x2y+xy2=xy(x+y)
(前两项合并 后两项合并)最后是等于xy(x+y)还是xy(y-x)?说明理由抱歉我出错了 -3x²y+2x²y+3xy²-2xy² =-x2y+xy2=xy(y-x)(前两项合并 后两项合并)最后答案是xy(y-x)