算术平方根、绝对值项均非负.又两项互为相反数,则两项均等于0.
5x+2y-9=0 (1)
2x-6y-7=0 (2)
(1)*2-(2)*5
34y=17 y=1/2
代入(1)
5x+1-9=0 x=8/5
x+1/y=8/5+2=18/5
x+1/y=18/5