50根-(50m-16m)x1根 = 16根
我的式子列错了,不过跟Skyport一个思路,一米来回消耗3根,100-3x=50, x=16米.
本帖于 2016-09-23 12:43:08 时间, 由普通用户 baby_baby 编辑
50根-(50m-16m)x1根 = 16根
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