Из ведра содержащего 5литр. воды отливают 1литр, а затем в ведродобавляют 1литр сока .премешав всё это, из ведра отливают 1литр смеси , затем в ведро опять вливают1 литр сока .опять перемешавают отивают 1литр смеси и вливают ещё раз.сколько после этого в ведре воды?

после первой операции вылить налить - 4 л воды и 1 л сока

выливая второй раз выливаем 1/5 имеющегося сока и 1/5 воды.

доливаем 1 л сока

получаем, что сока стало 4/5 + 1 = 9/5

третья операция снова  отливат 1/5 имеющегося сока и доливает литр

= 9/5 * 4/5 + 1 = 36/25 + 1 = 61/25 литров сока

воды соответственно осталось = 5 - 61/25 = 125/25 - 61/25 = 64/25 = 2,56 литра

1 литр, так как 1 литр оставили в другом ведре потом 4 литра смешивали с соком, потом смешали полученную смесь с соком, и следовательно в ведре остался 1 литр воды

Пошаговое объяснение:

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Пошаговое объяснение:

1) 2х=18-х

2х+1х=18 переносим х с противоположным знаком получается.

3х=18 - теперь решаем

х=18:3

х=6.

2)7-2х=3х-18

мы можем перенести 3х в левую сторону а 7 в правую так будет легче решать. Но, нужно помнить, что при переносе, нужно поменять знак на противоположный. И получается:

-3х-2х =-7-18

получаем

-5х=-25

х=-25:(-5)

х=5

(Положительное число получилось, потому что мы делили отрицательное на отрицательное, - на - даёт +)

3)0.2х+2.7=1.4-1.1х

Делаем тоже самое что и во втором уравнении

0.2х+1.1х= -2.7+1.4

считаем.

1.3х=-1.3

х= -1.3:1.3

х= -1.

Минус получился потому, что мы делили отрицательное на положительное

4)5.4-1.5х=0.3х-3.6

Переносим.

-1.5х+0.3х=-5.4-3.6

-1.2х=-9

х=-9:(-1.2)

х=7.5

5) Я не очень поняла как там записано, поэтому если хочешь, можешь написать не много по понятней,я решу