小明用19天看完了一本书,他每天看这本书的几分之几?9天看了这本书的几分之几?
小明用19天看完了一本书,他每天看这本书的几分之几?9天看了这本书的几分之几?
数学人气:959 ℃时间:2019-11-02 02:14:49
优质解答
1/19 9/19
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