从装满100克浓度为60％的糖水中倒出20克糖水·········
从装满100克浓度为60％的糖水中倒出20克糖水,再倒入清水将杯倒满,搅拌后再倒出20克糖水,然后再倒入清水将杯倒满,反复三次后,杯中糖水的浓度是多少?
人气：364 ℃ 时间：2020-06-04 01:05:20
解答
（100-20）÷100=80%
60%x80%x80%x80%=30.72%
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