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What is the missing number?[img]2018m11x/ct_eyyjscm_eyyjsciq_0105_201811[/img]A
What is the missing number?[img]2018m11x/ct_eyyjscm_eyyjsciq_0105_201811[/img]A
游客
2023-10-17
63
管理
问题
What is the missing number?
选项
A、748.
B、754.
C、745.
D、784
答案
B
解析
本题推理为:728=(5+5+6)/2+2×10+700,731=(8+6+8)/2+2×10+700。公式:?=(a+b+c)/n+m×10+700(注:n表示n个数字重复出现,m×10表示共有m个不同数字)。所以可得(9+7+8)/1+3×10+700=754。
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