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速算巧算：神奇又好玩的椅子数，轻松解决复杂问题，圆心数学思维
1988×198219821982 - 1982×198819881988 小学数学，小学奥数，简便运算，简便计算，小升初数学
小学数学-巧算+速算+简便计算92/485
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