X^2Y-3XY^2+2YX^2-Y^2X=?
问题描述:
X^2Y-3XY^2+2YX^2-Y^2X=?
答
X^2Y-3XY^2+2YX^2-Y^2X
=XY(X-3Y+2X-Y)
=XY(3X-4Y)