已知方程组a+3b+c=0,3a-3b-4c=0,求a:b:c
参考答案上写的是a:b:c=15:7:6 只是没有过程
人气:165 ℃ 时间:2020-05-11 20:54:00
解答
已知方程组a+3b+c=0,3a-3b-4c=0,求a:b:c
a+3b+c=0①
3a-3b-4c=0②
①+②得:4a-3c=0
移项得4a=3c
a=3 c=4
把a=3,c=4代入①得:
3+3b+4=0
b=-7/3
a:b:c=3::-7/3:4=9:-7:12
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