因为m=abc,所以有m = a*100 + b*10 + c即a = m % 100;b=(m/10)%10; c = m%10而bac = b*100 + a*10 +c,将上述代入bac的表达式即可
m=abc
m = a*100 + b*10 + c
a = m % 100;b=(m/10)%10; c = m%10
bac = b*100 + a*10 +c
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