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速算巧算：一个数×多个9的速算技巧，你认为值得学习吗，圆心数
6×99 7×999 8×9999 9×99999 2×99=198 3×99=297 4×99=396 5×99=495 6×99=594 7×99=693 8×99=792 9×99=891 小学数学，小学奥数，简便运算，简便计算，小升初数学，速算巧算
小学数学-巧算+速算+简便计算94/485
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