有位顾客买了6瓶啤酒,每瓶2.5元.退瓶时,售货员说:“每只瓶比酒钱少0.5元.”顾客
人气:125 ℃ 时间:2020-03-05 07:01:15
解答
6元
[(2.5-0.5)/2]*6=6
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