dillonmichaeld8069
07.02.2022 •
Mathematics
the difference of a two digit number and the number obtained on reversing the digit is always divisible by 9 (true or false)
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Ответ:
Yes!
Step-by-step explanation:
I know this from having been a bank teller. But let's examine the math.
Any two digit number can be written as 10x + y.
Reverse the digits would give you
10y + x
Subtract to find the difference.
10x + y - (10y + x)
10x + y - 10y - x
10x - x - 10y + y
9x - 9y
9(x - y)
Yes, it has 9 as a factor, so it is a multiple of 9.
Ответ:
it looks hard
Step-by-step explanation:
Idk about that