若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/20 08:40:39
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()

若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()

若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y=1/2(x+y)+(x-y)-3/2(x+y)-(x-y)=-(x+y)=-4

原式=-x-y=-(x+y)=-4

1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y=X/2+Y/2+4X-4Y-3X+3Y-3/2X+3/2Y-X+Y=(1/2+4-3-3/2-1)X+(1/2-4+3+3/2+1)Y=-X+2Y