Предмет: Алгебра, автор: larisaaghek19

ПЖ ПОМОГИТЕ 30 БАЛОВ ДАЮ

Двузначное число в 5 раз больше суммы его цифр. Если это число увеличить на 9, полученное число будет в 6 раз больше суммы цифр исходного двузначного числа. Найдите исходное двузначное число

Ответы

Автор ответа: korovkoelena582
1

10x+y двузначное число с цифрами xy

1) 10x+y=5(x+y)

2) 10x+y+9=6(x+y)

отнимем из 2 первое:

9=x+y     y=9-x

10x+(9-x)=5*9

9x+9=45

9x=36

x=4; y=5

число 45

Объяснение:

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