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kristinakorostelova
@kristinakorostelova
August 2022
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creepsmart
Составим уравнения для двух теплоходов:
s=v*t=90
s=(v+3)*(t-1)=90
Тогда
v=90/t
(90/t+3)(t-1)=90
(90+3t)(t-1)=90t
90t+3tˆ2-90-3t=90t
3tˆ2-3t-90=0
tˆ2-t-30=0
D=1+120=121
t1,2=(1+\-11)/2=6 часов
Тогда:
v=90/6=15 км/ч
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Answers & Comments
s=v*t=90
s=(v+3)*(t-1)=90
Тогда
v=90/t
(90/t+3)(t-1)=90
(90+3t)(t-1)=90t
90t+3tˆ2-90-3t=90t
3tˆ2-3t-90=0
tˆ2-t-30=0
D=1+120=121
t1,2=(1+\-11)/2=6 часов
Тогда:
v=90/6=15 км/ч