88【用手指计算乘法】法国小朋友用手指计算9的乘法又快又直观！难怪印度数学走红全世界，掌握了就是“速算天才”！
Synopsis
【用手指计算乘法】法国小朋友用手指计算9的乘法又快又直观！难怪印度数学走红全世界，掌握了就是“速算天才”！
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