Q14:
If 1050 – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?
A. 424
B. 433
C. 440
D. 449
E.
E.
467answer:c
看不懂这道题的题意,哪位好心人能指点迷津?
式子等于48*9+2+6=440,但为什么要出现"in base 10 notation"呢?
式子等于48*9+2+6=440,但为什么要出现"in base 10 notation"呢?
同问in base 10 notation是什么意思?
Thanks,
Demon Hunter
maybe you remember the "base 2 notation" in computer
any integer can be represented in "base 10 notation" as:
n=a0*10^0+a1*10^1+a2*10^2+...+an*10^n+...
and in "base 2 notation" as:
n=b0*2^0+b1*2^1+b2*2^2+...+bn*2^n+...
谢谢lovetiky版,说得很清楚
请你吃西瓜,呵呵
式子等于48*9+2+6=440,但为什么要出现"in base 10 notation"呢?
1050-74=9999....9926
黃色部份共有50-2
so 9*48+2+6=440
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