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三年级数学思维训练：“鸡兔同笼”，你知道小聪做对了几道题吗？
共20题，每题做对得5分，没做或做错扣2分，小聪得了79分，他做对了几道题？
三年级数学思维训练：36个专题，系统课程，全面提升！71/194
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