已知2a—b—5c=0,a+b—3c=0,求a:b:c.
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已知2a—b—5c=0,a+b—3c=0,求a:b:c.已知2a—b—5c=0,a+b—3c=0,求a:b:c.已知2a—b—5c=0,a+b—3c=0,求a:b:c.因为2A-B-5C=0①,A+B
已知2a—b—5c=0,a+b—3c=0,求a:b:c.
已知2a—b—5c=0,a+b—3c=0,求a:b:c.
已知2a—b—5c=0,a+b—3c=0,求a:b:c.
因为2A-B-5C=0①,A+B-3C=0② 则①+②:2A-B-5C+A+B-3C=0 3A-8C=0 3A=8C A=8/3C ①-2×②:2A-B-5C-2A-2B+6C=O -3B+C=0 B=1/3C 所以A/B/C=8/3C÷1/3C÷C=8