1. of/ the / let's/ history / museum / visit
2. to / to/ we'd /the/go/like /zoo
3. is / in /this /time/ my/vietnam / first .
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26 tháng 1 2018
Given a segment AB = 100cm. Let C be a point between A and B. Let M, N be respectively the midpoint of the segment BC, AC. Find the length of the segment MN.
Answer : MN = 50 cm
P/s : k mình nha bạn
8 tháng 12 2016
On the supposition that AB<AC
AK be the angle bisector of the triangle
\(\Rightarrow\) \(\frac{KB}{KC}=\frac{AB}{AC}=\frac{2}{3}\)
\(\Rightarrow\frac{MB-MK}{MC+MK}=\frac{MC-MK}{MC+MK}=\frac{2}{3}\)
\(\Rightarrow3MC-3MK=2MC+2MK\)
\(\Rightarrow MC=5MK\)
\(\Rightarrow BK=MC-MK=5MK-MK=4MK\)
Let AH be the height of the triangle
\(\Rightarrow\frac{S_{AKM}}{S_{ABK}}=\frac{\frac{AH.KM}{2}}{\frac{BK.AH}{2}}=\frac{KM}{4KM}=\frac{1}{4}\)
If AB > AC then
\(\Rightarrow CM=5MK\)
\(\Rightarrow Bk=CM+MK=5MK+MK=6MK\)
\(\Rightarrow\frac{S_{AKM}}{S_{AKB}}=\frac{\frac{AH.MK}{2}}{\frac{AH.BK}{2}}=\frac{MK}{6MK}=\frac{1}{6}\)
1. of/ the / let's/ history / museum / visit
Let's visit the museum of history.
2. to / to/ we'd /the/go/like /zoo
We'd like to go to the zoo.
3. is / in /this /time/ my/vietnam / first .
This is the first time in Viet Nam.
1. Let's visit the museum of history
2. We'd like to go to the zoo
3. This is my first time in Vietnam