8. Возьмем (4х-26) за у
Получаем уравнение 1836: у =18
у= 1836:18
у=102
теперь составляем уравнение 4х-26=у, где у=102
получаем 4х-26=102
известные в одну сторону, неизвестные в другую
4х=102+26
4х=128
х=128:4
х=32
Ширина- 15:3=5
пиримитер- (15+5)×2=40
площадь- 15×5=75
Не хватит 28.65(рублей) ,т. к. 200<228.65
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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?
<span>1. 3y-(5y)=11</span>
<span>3у-</span>5у=11
-2у=11
у=-11/2=-5,5
2.<span>(7x-1)-(6x-3)=5</span>
7х-1-6х+3=5
х=5+1-3
х=3