由题意:3x+y/2=1/2 (1),7x+3y=1/2(2)
(1)两边同乘以2,得:6x+y=1(3)
(2)两边同乘以2,得:14x+6y=1(4)
(3)两边同乘以6,再减去(4),得:36x+6y-14x-6y=6-1
22x=5
x=5/22
带入(3),得:y=1-30/22
=-4/11
由题意:3x+y/2=1/2 (1),7x+3y=1/2(2)
(1)两边同乘以2,得:6x+y=1(3)
(2)两边同乘以2,得:14x+6y=1(4)
(3)两边同乘以6,再减去(4),得:36x+6y-14x-6y=6-1
22x=5
x=5/22
带入(3),得:y=1-30/22
=-4/11