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小学奥数，钟面问题
七点半钟后,小彬开始做家庭作业,这时他看看钟,分针刚超过时针一点儿。过了不到1小时,小彬做完作业又看看钟,发现两针恰好是位置互换了。小彬做作业一共多少分钟?
小学数学，奥数37/87
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