|x-3|与|2x-7|互为相反数,求x+y+3的值
问题描述：
|x-3|与|2x-7|互为相反数,求x+y+3的值
答
|x-3|与|2x-7|互为相反数,
x=3 2y = 7 y= 7/2
求x+y+3的值
= 6+ 7/2
= 9.5