买2支铅笔和3支圆珠笔共花6元,买同样的3支铅笔和3支圆珠笔共用7.8元.问1支铅笔是多少元,1支圆珠笔呢?
人气:145 ℃ 时间:2020-06-02 13:47:24
解答
第二个条件-第一个条件
铅笔=7.8-6=1.8圆珠笔=(6-1.8*2)/3=0.8
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