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monkeygaming274
07.10.2019 •
Mathematics
Un train part de nîmes à 15h49 est arrive à clermont-ferrand à 20h10 après avoir parcouru 304,5km a) calculer la durée du trajet en h et en min. expliquer pourquoi cette durée est de 4,35h b) calculer la vitesse moyenne de ce train en km/h
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Ответ:
see explanation
Step-by-step explanation:
Given
2t -
= 3t +
( add
to both sides )
2t = 3t + 2
( subtract 3t from both sides )
- t = 2
( multiply both sides by - 1 )
t = - 2![\sqrt{2}](/tpl/images/2205/7829/7e821.png)
-----------------------------------------------------------
Given
(- x + 2
)(- 3x -
) = 0
Equate each factor to zero and solve for x
- x + 2
= 0 ( subtract 2
from both sides )
- x = - 2
( multiply both sides by - 1 )
x = 2![\sqrt{3}](/tpl/images/2205/7829/ba4cb.png)
- 3x -
= 0 ( add
to both sides )
- 3x =
( divide both sides by - 3 )
x = -![\frac{\sqrt{2} }{3}](/tpl/images/2205/7829/4aa8e.png)