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20.09.2019 •
Mathematics
The sum of two numbers is 13 and there difference is 5 what are the 2 numbers?
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Ответ:
x - y = 5
x = (13 - y)
(13-y) - y = 5
13 - 2y = 5
-2y = -8
y = 4
x - 4 = 5
x = 9
x=9, y = 4
Ответ: