Предмет: Математика, автор: AlisaMoskow21

НУ ПЛИЗ! ХЕЛП!

Задача. Потратили 600 рублей, это составило 2/3 от первоначальной суммы денег. Найдите первоначальную сумму.

Задача. Отрезок AB, равный 42 см, составляет 3/5 длины отрезка CD. Найти длину отрезка CD.

Задача. В магазин привезли арбузы. До обеда магазин продал 3/5 , после обеда – 1/3 привезённых арбузов, и осталось продать 80 арбузов. Сколько всего арбузов привезли в магазин?

Задача. Чтобы пройти до конца компьютерную игру Саша потратил всего 42 часа. Сколько часов в день играл Саша, если каждый день он проходил 1/14 всей игры?

Ответы

Автор ответа: Sebostyan
2

Ответ:

900,70,300,3

Пошаговое объяснение:

1.600*3/2=900 руб начальная сумма

2.42/3*5=70 см отрезок СД

3.1) 2/5 + 1/3 = 6/15 + 5/15 = 11/15 - продали

2) 1 - 11/15 = 15/15 - 11/15 = 4/15 - осталось продать

3) 4/15 = 80 арбузов. Находим целое по его части:

80 : 4 * 15 = 300 арбузов - привезли в магазин

Ответ: 300 арбузов

4.42*1:14=3 дня он прошел всю игру


AlisaMoskow21: пасиба :'>
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