Предмет: Математика, автор: 001rafik

Помогите пж даю много баллов
Школьная олимпиада

Приложения:

Ответы

Автор ответа: ШколотаУчёная
0

3) 0,5 *(-1)=-0,5

0,5-1=-0,5

0,5/-1=-0,5

Ответ: -1 и 0,5

4)

Решение: По теореме о внешнем угле треугольника сумма углов CKA и KCA равна углу CAB. Поскольку треугольник CAK – равнобедренный,  ∠ KCA =  ∠ CKA =  ∠ CAB/2. Аналогично,  ∠ BCM =  ∠ BMC =  ∠ CBA/2. Таким образом,  ∠ KCM =  ∠ KCA +  ∠ ACB +  ∠ BCM =  ∠ ACB + ( ∠ CAB +  ∠ CBA)/2 = 90 + 45 = 135.


5)1) 40*3.5\100=1.4 кг соли в 40 кг воды тихого океана

2) 1.4 кг составляет 0.5% смеси, значит

вся смесь составляет

1.4 : 0.005=280 кг - масса смеси

3) 280-40=240 кг - нужно добавить пресной воды

ответ: 240 кг


 




Автор ответа: Zakharzhevlakov
0

1) Вася загадал 5 , 0

Второй я не знаю

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