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

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

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

(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