一草地,27头牛6天吃完,23头牛9天吃完,21头牛几天吃完?
人气：279 ℃ 时间：2020-03-30 14:17:54
解答
设草原来有x,每天长y
x + 6y = 27 * 6
x + 9y = 23 * 9
得x=72,y=15
设21头牛t天吃完
72 + 15t = 21 * t
得t = 12
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