Math problem, please help?
2015-11-28 7:34 pm
By deleting the last digit of a natural number, the number becomes 14 times smaller. How many natural numbers are there that satisfy this condition? Please show your wok..
回答 (1)
2015-11-28 8:24 pm
Let 10x + y be the natural number, by deleting the last digit of 10x + y, it becomes x , so
10x + y = 14x
y = 4x
But y is a natural number not more then 9, if x = 1, y = 4 ; if x = 2 , y = 8.
All required numbers are 10(1)+4 = 14 and 10(2)+8 = 28.
10x + y = 14x
y = 4x
But y is a natural number not more then 9, if x = 1, y = 4 ; if x = 2 , y = 8.
All required numbers are 10(1)+4 = 14 and 10(2)+8 = 28.
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https://hk.answers.yahoo.com/question/index?qid=20151128113448AAFclht