问题
单项选择题
设M、N都是自然数，记PM是自然数M的各位数字之和，PN是自然数N的各位数字之和。又记M*N是M除以N的余数。已知M+N=4084，那么(PM+PN)*9的值是多少
A．7
B．9
C．0
D．5
答案
参考答案：A
解析：特殊值法。可取M=4000，N=84，则PM+PN=16，(PM+PN)* 9=7。
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设M、N都是自然数，记PM是自然数M的各位数字之和，PN是自然数N的各位数字之和。又记M*N是M除以N的余数。已知M+N=4084，那么(PM+PN)*9的值是多少
A．7
B．9
C．0
D．5
参考答案：A
解析：特殊值法。可取M=4000，N=84，则PM+PN=16，(PM+PN)* 9=7。
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