2個方法:
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1. X, (樓上個ans)
2. 用括號括住個 numeral, e.g. I = 1, ( I ) = 1,000
X = 10 所以 (X) = 10,000,
號括可以疊o黎用, e.g. I = 1, ( I ) = 1,000, (( I )) = 1 x 1000 x 1000 = 1,000,000, 表示再大ge number 都得.
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