Предмет: Математика, автор: евродом

два пешехода отправляются одновременно навстречу друг другу из двух пунктов,расстояние между ними 24 км, и встречаются через 3 часа определить скорость каждого пешехода, если у одного из них она на 2 км/ч меньше чем у другого.

Ответы

Автор ответа: tanped
0
1)24:3=8(км/ч)-скорость сближения
2)8-2=6(км/ч)-удвоенное число
3)6:2=3(км/ч)-скорость одного пешехода
4)3+2=5(км/ч)-скорость второго пешехода
уравнением:
Пусть х км/ч скорость одного пешехода,тогда скорость другого (х-2) км/ч,  составим уравнение:
(х+х-2)*3=24
(2х-2)*3=24
2х-2=24:3
2х-2=8
2х=8+2
2х=10
х=10:2
х=5 км/ч-это скорость одного пешехода
2)5-2=3(км/ч)-скорость второго пешехода
это же уравнение можно ещё решить так:
(х+х-2)*3=24
(2х-2)*3=24
6х-6=24
6х=24+6
6х=30
х=30:6
х=5 км/ч -ну а потом второе действие.

         
Автор ответа: евродом
0
нам надо через уравнение
Автор ответа: евродом
0
пожалуйста,помогите как решить с x .
Автор ответа: tanped
0
ну вот как-то так.........
Автор ответа: евродом
0
огромное спасибо
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