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已知a+b+c=39,且1/a:1/b:1/c=2:3:4，求a、b、c各是多少？
小学数学比的应用题
五六年级数学132/146
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小学数学比的应用题
App01:38App01:59App01:14App01:37App01:19App01:29App01:12App01:39App01:26App01:14App01:43App01:15App01:34App02:15App01:27App01:12
