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整除特征作用大@五年级数学
有7支钢笔，它们的价钱分别是12元，15元，17元，20元，22元，24元，26元。甲先买走一支，剩下的由乙、丙、丁三人买走，已知乙和丙花的钱数正好相等，都是丁的2倍，那么甲先买走的那只钢笔的价钱是多少？
五年级秒思数学20/64
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