Giúp với mai kt rồi !!
1 người đi xe máy từ A-> B dự định mất 3g 20p, nếu người đó tăng vận tốc thêm 5km/h thì sẽ đến B sớm 20 phút,Tính khoảng cách a -> B và vận tốc dự định của người đó
K
Khách
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12 tháng 4 2019
có tất cả 4 nguoi
3 con ngua
theo bai ra ta co
số người > so ngua la 1 , 2 nguoi cuoi 1 con va con thua dung 1 con
suy ra so nguoi la so chan
so ngua la so le
ta thu
2 nguoi 1 ngua
thi vua du so nguoi(loai)
4nguoi 3 ngua
thi 4 ngoi cuoi 2 con va thua 1 con(thoa man)
NT
0
NV
0
LD
3
11 tháng 4 2019
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ta có \(3h20p=3\frac{1}{3}h ; 20p=\frac{1}{3}h\)
Nếu đi sớm hơn được 20 phút thì từ A -> B sẽ mất :\(3h20p-20p=3h\)
Gọi v là vân tốc từ A -> B trong dự định
Gọi ( v + 5 ) là vận tốc từ A -> B nếu tăng vận tốc thêm 5km/h
Có \(S=v.t\)
\(\Rightarrow S=v.3\frac{1}{3}\)
\(\Rightarrow S=3\left(v+5\right)\)
\(\Rightarrow v.3\frac{1}{3}=\left(v+5\right).3\)
\(\Rightarrow v.3\frac{1}{3}=3v+15\)
\(\Rightarrow\frac{10}{3}v=3v+15\)
\(\Rightarrow\frac{10}{3}v-3v=15\)
\(\Rightarrow\frac{1}{3}v=15\)
\(\Rightarrow v=15:\frac{1}{3}=45 \)(km/h)
=> Vận tốc dự định của người đó là 45 km/h
Có \(S=\left(v+5\right).3\)
\(\Rightarrow S=\left(45+5\right).3\)
\(\Rightarrow S=50.3=150\left(km\right)\)
giúp vs