已知|x-y+3|+(2x+y)^2=0,求4x+3y的值 已知|x-y+3|+(2x+y)^2=0,求4x+3y的值

题目

已知|x-y+3|+(2x+y)^2=0,求4x+3y的值 已知|x-y+3|+(2x+y)^2=0,求4x+3y的值
1.已知|x-y-1|+(x+y)^2=0,求2x+3y的值
2.已知|x-y+3|+(2x+y)^2=0,求4x+3y的值
急

答案

1.x-y-1=0,x+y=0,x=1/2,y=-1/2,2x+3y=1-3/2=-1/2.
2.x-y+3=0,2x+y=0.x=-1,y=2.4x+3y=-4+6=2.