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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!

题目详情
GMAT数学if 10^50-74 is written as an integein base10 notation.
如题if 10^50-74 is written as an integein base10 notation,what is the sum of the digits in that integer?
选项为(A)424 (B)433 (C)440 (D)449 (E)467
顺便求解及分析!
▼优质解答
答案和解析
integein 写错了是integer in.
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