作业帮2x-y/x+y=4,则4x-2y/2x+2y+3x+3y/2x-y
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/13 08:26:01
2x-y/x+y=4,则4x-2y/2x+2y+3x+3y/2x-y
2x-y/x+y=4,则4x-2y/2x+2y+3x+3y/2x-y
2x-y/x+y=4,则4x-2y/2x+2y+3x+3y/2x-y
4x-2y/2x+2y+3x+3y/2x-y
=2(2x-y)/2(x+y)+3(x+y)/2x-y
=4+3/4
=19/4
=2/2*(2x-y/x+y)+3*(x+y/2x-y)=4+3/4=4.75