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Помрлтм245
Помрлтм245
03.07.2020 22:38 •  Математика

При каком значении z сумма 5z и 15z равна840?

👇
Ответ:
AlinaFirdysovna5
AlinaFirdysovna5
03.07.2020

5z+15z=840

20z=840

z=840^20

z=42

ответ при значении z 42.

проверка 5*42+15*42=210+630=840, ответ верен

4,6(82 оценок)
Ответ:
lisasmirnova26
lisasmirnova26
03.07.2020

Если я правильно понял условие, у нас уравнение 5*z+15*z=840

5z+15z=840

20z=840

z=840/20

z=42

 

4,5(89 оценок)
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Ответ:
Предположим это некоторое число х. При его делении на 8 мы получим целую часть и остаток 5, то есть x = n*8 + 5, где n это целое число восьмерок входящих в x, а 5 остаток. При умножении числа x также будут умножены слагаемые правой части равенства: y*x = y*n*8 + y*5, где y*5 также может содержать целую часть при делении на 8, то есть остатком от деления y*x на 8 будет остаток от деления y*5 на 8, и по условию задачи это должно быть число 2. При y = 2, данное условие выполняется. 
ответ: 2.
Так же подойдут числа 10, 18, 26, 34, ...
4,6(40 оценок)
Ответ:
tseng7788
tseng7788
03.07.2020

Пошаговое объяснение:

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