既然是3位數(shù)字,那么考慮區(qū)間就是100-999
情況1,有一個(gè)5:9*9=81個(gè)
情況2,有兩個(gè)5:9+9=18個(gè)
情況3,有三個(gè)5:1個(gè)
總共:100個(gè)
How many 3 digits numbers have exactly one digit 5 in them?
How many 3 digits numbers have exactly one digit 5 in them?
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ji
數(shù)學(xué)人氣：652 ℃時(shí)間：2020-03-17 20:17:08
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