计算(2X)^2(-XY)^3-(-3XY)(-2X^2Y)^2
问题描述：
计算(2X)^2(-XY)^3-(-3XY)(-2X^2Y)^2
答
-3/4（-2x^2y)^2乘以(-1/3xy)-(-xy)^3乘以（-x^2)
＝(－3/4)*(-1/3) *4(x^4)(y^2)×(xy) －(x^3)(y^3)×(x^2)
=(x^5)(y^3) -(x^5)(y^3)
=0
答
(2X)²(-XY)³-(-3XY)(-2X^2Y)²
=4X²（-X³Y³)+3XY(4X²Y²)
=-4X^5Y³+12X³Y³