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[Problem Solving]

试题详情

题目:

The function f  is defined for each positive three-digit integer n by f ( n ) = 2x 3y 5z, where x , y and z are the hundreds, tens, and units digits of n , respectively. If m  and v  are three-digit positive integers such that ( m ) = 9  f  ( v ), then m - v =

选项:

A、8
B、9
C、18
D、20
E、80

答案:

D

提问:

PS

解答:

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阅读1307
解答: sysadmin

提问:

请老师讲解思路

解答:

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阅读1393
解答: sysadmin老师

提问:

PS

解答:

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阅读1308
解答: sysadmin老师

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