l六年级同学收集旧废电池91节,五年级比六年级少收集七分之一五年级收集了多少节?
人气:493 ℃ 时间:2019-11-12 04:55:41
解答
五年级收的有
91*(1-1/7)
=91*6/7
=78
五年级收了78节电池
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