Предмет: Математика, автор: Damirt2007

Турист прошёл 90 км. За 1 день он прошёл а км. Во второй 10 км. А в третий 4/5 км Сколко км прошёл за третий день? Помогите п-ста !!!!♡♡заранее спасибо

Ответы

Автор ответа: Folz32
0

1 день- (х+10) км

2 день- х км

3день- (х+(х+10))*4/5 км

за три дня прошёл 90 км 

Сколько километров проходил турист каждый день ?

получили уравнение

(х+10)+х+(4*(х+(х+10)))/5=90-обе части ур-ния умножим на 5

5х+50+5х+8х+40=450

18х+90=450

18х=450-90

18х=360

х=360/18

х=20 км -2 день

х+10=20+10=30 км- 1 день

(х+(х+10)*4/5=(20+20+10)*4/5=50*4/5=40 км- 3 день

20+30+40=90 км- за три дня.

Автор ответа: Damirt2007
0
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