If 1050 – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?
有没有什么方法算啊。请指教!!
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10的50次方有51位数,50个零,所以9有48个
即:9999。。。99926
48个
所有的数字相加为48*9+2+6=432+8=440
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