作业帮（1）（2xy-y）-(-y+yx)(2)3x²-[7x-(4x-3)-2x²]
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/09 10:30:27
![（1）（2xy-y）-(-y+yx)(2)3x²-[7x-(4x-3)-2x²]](/uploads/image/z/638000-8-0.jpg?t=%EF%BC%881%EF%BC%89%EF%BC%882xy-y%EF%BC%89-%28-y%2Byx%29%282%293x%26%23178%3B-%5B7x-%284x-3%29-2x%26%23178%3B%5D)
（1）（2xy-y）-(-y+yx)(2)3x²-[7x-(4x-3)-2x²]
（1）（2xy-y）-(-y+yx)
(2)3x²-[7x-(4x-3)-2x²]
（1）（2xy-y）-(-y+yx)(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
（1）原式=2xy-y+y-yx=xy
（2）原式=3x²-7x+4x-3+2x²=5x²-3x-3
1、2XY-Y+Y-XY=XY
2、3X方-7X+4X-3+2X方=5X方-3X-3
1、原式=2xy-y+y-xy=xy
2、原式=3x²-3x-3+2x²=5x²-3x-3