数学问题解方程已知a+3b+c=0 求a:b:c 3a-3b-4c=0
问题描述:
数学问题解方程已知a+3b+c=0 求a:b:c 3a-3b-4c=0
答
怎么有点“无伦次”?∵a+3b+c=0 3a-3b-4c=0∴4a-3c=0 => 4a=3c => a:c=3:4=9:12∵3a+9b+3c=0 => 3a+9b+4a=0 => 7a=-9b => a:b=-9:7=9:-7 ∴a:b:c=9:-7:12...