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速算任意两位数的平方，92^2，根本不用草稿纸
乘法速算法 速算任意两位数的平方，92^2，根本不用草稿纸 23*23 36*36 92*92 78*78 42*42 61*61
神奇速算系列教程，欢迎收藏转发22/23
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