问题描述:
if the tens digit x and the units digit y of a positive integer n are reversed,the resulting intger is 9 more than n.What is y in terms of
a 10-x b 9-x c x+9 d x-1 e x+1
a 10-x b 9-x c x+9 d x-1 e x+1
问题解答:
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