化简 x²y-3xy²+2yx²-y²x

来源：学生作业帮助网编辑：作业帮时间：2024/05/09 14:20:06

化简 x²y-3xy²+2yx²-y²x
化简 x²y-3xy²+2yx²-y²x

化简 x²y-3xy²+2yx²-y²x
原式=（1+2）x^2y+(-3-1)xY^2
=3x^2y-4xy^2

x²y-3xy²+2yx²-y²x
=（1+2）x²y-(3+1)xy²
=3x²y-4xy²