40 : 2= 20 (руб.)- заплатили за 1книгу.
20 * 3= 60 (руб)-заплатили за 3 книги.
Ответ:60 рублей надо заплатить за три одинаковые книги.
1) 9+12=21(кг) - всего
2)21:3=7(шт) - количество
Ответ: израсходовали 7 пакетов
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1. Математическое выражение, стоящее под
знаком обыкновенной дроби.
2. Как на Руси называли дроби?
3. Кто впервые в Европе ввёл десятичные
дроби?
4. Математическое выражение, стоящее над
знаком обыкновенной дроби.
5. Формат дроби.
6. В какой стране впервые
встречаются десятичные дроби?
7. Как называется эта дробь 9/8
?
8. Формат дроби.
9. Греческий математик, который
ввёл слова «числитель» и «знаменатель» в оборот?
10. Число, состоящее из одной или
несколько частей (долей) единицы?
х трёхзначное число
5000+х-(10х+5)=747
9х=4248
х= 472
значит исходное число 5472
сумма цифр 5+4+7+2= 18
<span>Ответ 18 </span>
1)9*7=63
2)9*3=27
3)9+1=10
4)10-9=1