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The number system, single digit in lower left corner.
数字系统,在左下角的单个数字。
youdao
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This trick is a general solution for multiplying any single-digit number by 9.
这个技巧是应对任何个位数字乘以9的算式。
youdao
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This trick is a general solution for multiplying any single-digit number by 9.
这个技巧是应对任何个位数字乘以9的算式。
youdao