4a+2b+c=5 (1)
4a-2b+c=-3 (2)
a+b+c=0 (3)
(1)+(2)得:8a+2c=2 ,即:4a+c=1(4)
(2)+(3)x2 得:6a+3c=-3,即:2a+c=-1 (5)
(5)-(4)得:a=1
把a=1代人(4)得:c=-3,
再把a=1,c=-3代人(3)得:b=2,
4a+2b+c=5 (1)
4a-2b+c=-3 (2)
a+b+c=0 (3)
(1)+(2)得:8a+2c=2 ,即:4a+c=1(4)
(2)+(3)x2 得:6a+3c=-3,即:2a+c=-1 (5)
(5)-(4)得:a=1
把a=1代人(4)得:c=-3,
再把a=1,c=-3代人(3)得:b=2,