a+b+c=0 (1) 4a+2b+c=5 (2) 4a-2b+c=-1 (3) (2)-(3) 4b=-4 b=-1 代入(1),(2) a-1+c=0 4a-2+c=5 相减 3a-1这道题的(2)-(3)4b=-4 b=-1是不是算错了?4a+2b+c=5 (2) 4a-2b+c=-1 (3)5-(-1)=6而不是5-1吧?
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![a+b+c=0 (1) 4a+2b+c=5 (2) 4a-2b+c=-1 (3) (2)-(3) 4b=-4 b=-1 代入(1),(2) a-1+c=0 4a-2+c=5 相减 3a-1这道题的(2)-(3)4b=-4 b=-1是不是算错了?4a+2b+c=5 (2) 4a-2b+c=-1 (3)5-(-1)=6而不是5-1吧?](/uploads/image/z/765447-15-7.jpg?t=a%2Bb%2Bc%3D0+%281%29+4a%2B2b%2Bc%3D5+%282%29+4a-2b%2Bc%3D-1+%283%29+%282%29-%283%29+4b%3D-4+b%3D-1+%E4%BB%A3%E5%85%A5%281%29%2C%282%29+a-1%2Bc%3D0+4a-2%2Bc%3D5+%E7%9B%B8%E5%87%8F+3a-1%E8%BF%99%E9%81%93%E9%A2%98%E7%9A%84%282%29-%EF%BC%883%EF%BC%894b%3D-4+b%3D-1%E6%98%AF%E4%B8%8D%E6%98%AF%E7%AE%97%E9%94%99%E4%BA%86%3F4a%2B2b%2Bc%3D5+%282%29+4a-2b%2Bc%3D-1+%283%295-%EF%BC%88-1%EF%BC%89%3D6%E8%80%8C%E4%B8%8D%E6%98%AF5-1%E5%90%A7%3F)
a+b+c=0 (1) 4a+2b+c=5 (2) 4a-2b+c=-1 (3) (2)-(3) 4b=-4 b=-1 代入(1),(2) a-1+c=0 4a-2+c=5 相减 3a-1这道题的(2)-(3)4b=-4 b=-1是不是算错了?4a+2b+c=5 (2) 4a-2b+c=-1 (3)5-(-1)=6而不是5-1吧?
a+b+c=0 (1) 4a+2b+c=5 (2) 4a-2b+c=-1 (3) (2)-(3) 4b=-4 b=-1 代入(1),(2) a-1+c=0 4a-2+c=5 相减 3a-1
这道题的(2)-(3)4b=-4 b=-1
是不是算错了?4a+2b+c=5 (2) 4a-2b+c=-1 (3)
5-(-1)=6而不是5-1吧?
a+b+c=0 (1) 4a+2b+c=5 (2) 4a-2b+c=-1 (3) (2)-(3) 4b=-4 b=-1 代入(1),(2) a-1+c=0 4a-2+c=5 相减 3a-1这道题的(2)-(3)4b=-4 b=-1是不是算错了?4a+2b+c=5 (2) 4a-2b+c=-1 (3)5-(-1)=6而不是5-1吧?
哦,对不起,是错了
a+b+c=0 (1)
4a+2b+c=5 (2)
4a-2b+c=-1 (3)
(2)-(3)
4b=6
b=3/2
代入(1),(2)
a+3/2+c=0
4a+3+c=5
相减
3a+3/2=5
a=7/6
c=0-b-a=-8/3
所以
a=7/6,b=3/2,c=-8/3