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dfhhu
dfhhu
13.09.2022 05:11 •  Алгебра

Скільки потрібно взяти молока, щоб отримати 504 кг масла, якщо відомо, що маса вершків становить 21 % маси молока, а маса масла становить 24 % маси вершків?

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Ответ:
Evelina300606
Evelina300606
07.03.2020 08:49

2.17. из трехзначных а 5 делятся  100, 105,110; 115..,995

Пусть всего n чисел делится на 5, тогда увидев, что их можно посчитать с формулы n- го члена арифметической прогрессии, получим aₙ=a₁+d*(n-1), где  а₁=100; aₙ=995, d=5,  найдем n. подставим данные в формулу. получим

995=100+5*(n-1); 199=20=n-1⇒n=199+1-20=180

значит, трёхзначных чисел, делящихся на 5, 180.

Аналогично найдем количество трёхзначных чисел, делящихся на 7.

105, 112, 119...,994; а₁=105; aₙ=994, d=7.

994=105+7*(n-1); n-1=142-15; n=128

значит,  трёхзначных чисел, делящихся на 7, 128.

на два делятся четные. Всего 999-99=900 трехзначных, половина из них четные. т.е. четных 450

Тогда общее количество искомых чисел, 450+180+128=758

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Ответ:
Nikidiy
Nikidiy
28.10.2021 15:56

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is my mother. She has baked a delicious strawberry pie.

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are my parents. My Mom’s name is Ann and my father’s name is Tom

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are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

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are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

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are my parents. My Mom’s name is Ann and my father’s name is Tom

is my mother. She has baked a delicious strawberry pie.

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0,0(0 оценок)
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