(1)y+1/y=5/2 (2) 2y+6/y=7 (3) y+1/y+2=0

问题描述:

(1)y+1/y=5/2 (2) 2y+6/y=7 (3) y+1/y+2=0

(1)y=2或者1/2
(2) y=2或者3/2
(3)y=-1