可以买甲级铅笔15支
乙级铅笔10支
甲级铅笔5角钱一支,乙级铅笔7角钱一支,用7.5元可买这两种铅笔各几支
甲级铅笔5角钱一支,乙级铅笔7角钱一支,用7.5元可买这两种铅笔各几支
数学人气:740 ℃时间:2020-02-01 09:27:27
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