(2xy^2-3x^3y)(-2xy^2+3x^2y) 2.(2x-3y+4z)(2x+3y-4z)
问题描述:
(2xy^2-3x^3y)(-2xy^2+3x^2y) 2.(2x-3y+4z)(2x+3y-4z)
3.______-8ab+4=(________+2)^2
答
1.-(2XY^2-3X^2Y)^2
2.4X^2-9Y^2-16Z^2+24YZ
3.4a^2b^2 -8ab+4=( 2ab +2)^2