问题标题:
GMAT数学if10^50-74iswrittenasanintegeinbase10notation.如题if10^50-74iswrittenasanintegeinbase10notation,whatisthesumofthedigitsinthatinteger?选项为(A)424(B)433(C)440(D)449(E)467顺便求解及分析!
问题描述:
GMAT数学if10^50-74iswrittenasanintegeinbase10notation.
如题if10^50-74iswrittenasanintegeinbase10notation,whatisthesumofthedigitsinthatinteger?
选项为(A)424(B)433(C)440(D)449(E)467
顺便求解及分析!
韩建枫回答:
integein写错了是integerin.
假如10^50-74写作一个十进制的整数,那么这个整数的各个数字的总和是多少?
10^3=1000-74=926
10^4=10000-74=9926
10^5=100000-74=99926
规律:50-2=48个9和26
所以:
48*9+2+6
=432+2+6
=440
C
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