431.
а) (5/12 + 3/8) * 12/19
1)5/12 + 3/8 = 10/24 + 9/24 = 19/24
2)19/24 * 12/19 = 1/2
б)6/7(11/18- 5/12)
1)11/18 - 5/12 = 22/36 - 15/36 = 17/36
2)6/7 * 17/36 = 17/42
в) (3 1/14 - 2 5/7)*(7 - 6 3/5) =
1)3 1/14 - 2 5/7 = 1 1/14 - 10/14 = 14/14 + 1 /14 - 10/14= 5/14
2) 7 - 6 3/5 = 6 5/5 -6 3/5 =2/5
A) x = -4.08 / 3
x = <span>-1.36
в) x = -0.45 /-5
x = </span><span>0.09</span>
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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?
Ответ:
Пошаговое объяснение:
Площадь прямоугольника вычисляем по формуле С= а *в= 4*1=4 см в квадрате,потом находим сторону квадрата.
Площадь прямоугольника равна площади квадрата,поэтому сторона квадрата равна 2 см .
1)4*1=4(см в квадрате)-площадь прямоугольника,
2)4:2=2(см)-сторона квадрата
Начерти квадрат со сторонами 2 см