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Викторина: Математика 8 класс

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Викторина: Математика 8 класс

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Задачи по основным темам 8 класса

Created by

Sevinch
Sevinch
Uzbekistan

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Викторина: Математика 8 класс
 

Викторина: Математика 8 классOnline version

Задачи по основным темам 8 класса

by Sevinch
1

Решите уравнение: 2x + 3 = 11. Найдите x.

2

Площадь прямоугольника: длина 7, ширина 4. Чему равна S= ?

3

Каков процент от числа 150, равный 30?

4

Если 3 кг яблок стоят 270 руб, сколько стоит 5 кг?

5

Решите линейное уравнение: 5x − 7 = 3x + 9. x = ?

6

Площадь трапеции: основания 5 и 3, высота 4. S = ?

7

Периметр квадрата со стороной 6: P = ?

8

Гипотенуза треугольника с катетами 3 и 4 равна?

9

Уравнение: 2(y−3)=4. Найдите y.

10

Если y пропорционально x и y=6 при x=2, то при x=5 y = ?

Объяснение

Правильно: 2x = 8, x = 4. Остальные варианты дают неверные значения.

Площадь = длина × ширина = 7×4 = 28. Остальные варианты неверны.

30 — это 20% от 150. Остальные проценты не дают 30.

Цена пропорциональна весу: 270÷3=90 за кг, 90×5=450.

Переместим: 2x = 16 → x = 8. Остальные варианты неверны.

S = ((5+3)/2)×4 = 4×4 = 16. Остальные варианты неверны.

Периметр квадрата = 4×сторона = 24. Остальные варианты неверны.

По теореме Пифагора: sqrt(3^2+4^2)=5. Остальные варианты неверны.

Раскрыв скобки: 2y−6=4 → 2y=10 → y=5.

Коэффициент пропорциональности k = y/x = 3. Y=3×5=15. Остальные значения неверны.

 
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