问几道计算题、
(2/3)^-1+(π-3)^0+(-2)^-2+ |(-2)^3 |
(2X-3Y)(3Y-2X)
(3x-y)^2-(-2x+3)(-2x-3)
4x^2-(-2x+3)(-2x-3)
2x(a-b)-(b-a)
人气:377 ℃ 时间:2020-03-25 02:09:20
解答
(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)=9...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(3x-y)^2-(3x+y)-2xy=(3x-y-2)(3x-y+1)
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