美好2
幼苗
共回答了20个问题采纳率:85% 举报
(2/3)^-1+(π-3)^0+(-2)^-2+ |(-2)^3 |
=3/2+1+1/4+8
=9又7/4
(2X-3Y)(3Y-2X)
=-(2X-3Y)²
=-(4X²-12XY+9Y²)
=-4X²+12XY-9Y²)
(3x-y)^2-(-2x+3)(-2x-3)
=(9x²-6xy+y²)-(4x²-9)
=9x²-6xy+y²-4x²+9
=5x²-6xy+y²+9
4x^2-(-2x+3)(-2x-3)
=4x^2-(4x^2-9)
=4x^2-4x^2+9
=9
2x(a-b)-(b-a)
=2x(a-b)+(a-b)
=(a-b)(2x+1)
1年前
追问
9
闲逛不流浪
举报
谢谢了、不过有一题我提问的时候打错了、应该是 (3x-y)^2-(3x+y)-2xy 、帮帮我、给你最佳
举报
美好2
(3x-y)^2-(3x+y)-2xy =(3x-y-2)(3x-y+1)