(1)(2xy-y)-(-y+yx)
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/23 19:26:15
(1)(2xy-y)-(-y+yx)
(2)3x²-[7x-(4x-3)-2x²]
(2)3x²-[7x-(4x-3)-2x²]
(2xy-y)-(-y+yx)
=(2x-1)y-(-1+x)y
=(2x-1+1-x)y
=xy
3x²-[7x-(4x-3)-2x²]
=3x²-[7x-4x+3-2x²]
=3x²-7x+4x-3+2x²
=5x²-3x-3
再问: 3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1
再答: (3x²y-xy²)-3(x²y-2xy²)=3x²y-xy²-3x²y+2xy²=xy²当x=1/2,y=1/3时,原式=xy² =1/2×(1/3)² =1/18
=(2x-1)y-(-1+x)y
=(2x-1+1-x)y
=xy
3x²-[7x-(4x-3)-2x²]
=3x²-[7x-4x+3-2x²]
=3x²-7x+4x-3+2x²
=5x²-3x-3
再问: 3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1
再答: (3x²y-xy²)-3(x²y-2xy²)=3x²y-xy²-3x²y+2xy²=xy²当x=1/2,y=1/3时,原式=xy² =1/2×(1/3)² =1/18
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