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数学
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已知a:b:c=2:3:5,计算(10a+12b+5c)/(a+b+c)的值
人气:462 ℃ 时间:2020-04-09 21:20:22
解答
设a=2t,b=3t,c=5t,则
(10a+12b+5c)/(a+b+c)
=(20t+36t+25t)/(2t+3t+5t)
=(81t)/(10t)
=8.1
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