Xin lỗi nha mình cho hơi nhiều bài. Nhưng mình cần gấp. Bạn nào ko làm đc hết thì ko saonha
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
TL
0
HT
6 tháng 2 2020
My favourite film is The Hancock (2008), it's about the funny story about the lazy superhero Hancock. Because of his inherent bad habits, Hancock was hated by everyone. And to regain the image of a beloved Superhero, Hancock has a plan ... the main actors about Will Smith, Charlize Theron, Jason Bateman and Jae Head
23 tháng 7 2020
bn thông minh đấy, nhưng mik ko thông minh mà bt mấy cái đó
MA
4 tháng 12 2017
Nam : Hi Song !
Song : Hello Nam !
Nam : how are you ?
Song : i am fine . And you?
Nam : me too
Song :oh! Look that , ARE not Mai and Na right?
Nam : yes . Ehh Mai , Na
Mai and Na : huh
Nam : come on
Na : what's up?
SOng : coming to Lunar New Year, Do you have any plans?
Mai : yes . Everyyear there r many special occasions in VN, but TET holiday is considered the most significant event to vietnamese. In that time, all vietnamese family members try to come back their homes and get togheter.Last tet holiday, i also had a good time with my family.to prepare for tet, i n' my sister bought many things such as: new clothes, foods, fruits... We also bought much paints to repair my house. THe kumquat tree and peach flower are the most important things that can't lack in my family. after cleaning the house, my parents taught to make banh chung .it seemed so hard to me, but ...................
Everyyear there r many special occasions in VN, but TET holiday is considered the most significant event to vietnamese. In that time, all vietnamese family members try to come back their homes and get togheter.Last tet holiday, i also had a good time with my family.to prepare for tet, i n' my sister bought many things such as: new clothes, foods, fruits... We also bought much paints to repair my house. THe kumquat tree and peach flower are the most important things that can't lack in my family. after cleaning the house, my parents taught to make banh chung .it seemed so hard to me, but ...................
Nam : Will we have a party?
Na : That's a good idea!
Song : Ok
Mai: of course
4 tháng 12 2017
Nam:hi,Phong
Phong:oh hi,how are you?
Nam:Iam fine thank you,and you
Phong:Iam OK
Nam:Who are there?
Phong:There are Mai and Anna
Mai and anna:hello
Nam:Nice to meet you!
Mai and anna:Nice to meet you too
Mai: what are you doing?
Phong:we are taking about cycling,are you cycling with them?
Mai:Great idea
Phong,Nam,Anna,Mai:Let's go
Do gấp quá nên mình làm nhanh dở thì đừng chê nhoa
15 tháng 9 2021
\(a,\left\{{}\begin{matrix}AC=AH\left(GT\right)\\AB.chung\\\widehat{CAB}=\widehat{BAH}\left(=90^0\right)\end{matrix}\right.\Rightarrow\Delta ACB=\Delta AHB\left(c.g.c\right)\)
\(b,\left\{{}\begin{matrix}\widehat{ACB}=\widehat{CBK}\left(so.le.trong\right)\\\widehat{ABC}=\widehat{BCK}\left(so.le.trong\right)\\BC.chung\end{matrix}\right.\Rightarrow\Delta ABC=\Delta KCB\left(g.c.g\right)\Rightarrow AC=BK\left(2.cạnh.tương.ứng\right)\)
\(c,CH=AC+AH=2AC=2AB=BM\\ \left\{{}\begin{matrix}CK//AB\\AB\perp AC\end{matrix}\right.\Rightarrow CK\perp AC\Rightarrow\widehat{ACK}=90^0\\ \left\{{}\begin{matrix}BK//AC\\AC\perp AB\end{matrix}\right.\Rightarrow KB\perp AB\Rightarrow\widehat{ABK}=90^0\\ \left\{{}\begin{matrix}\widehat{ACK}=\widehat{ABK}\left(=90^0\right)\\CH=BM\left(cm.trên\right)\\AC=BK\left(cm.trên\right)\end{matrix}\right.\Rightarrow\Delta CHK=\Delta BMK\left(c.g.c\right)\)
\(d,\Delta CHK=\Delta BMK\left(cm.trên\right)\\ \Rightarrow\widehat{CKH}=\widehat{BKM}\Rightarrow\widehat{CKH}+\widehat{HKB}=\widehat{BKM}+\widehat{HKB}\\ \Rightarrow\widehat{CKB}=\widehat{HKM}\\ \Rightarrow\widehat{BAC}=\widehat{HKM}\left(\Delta ABC=\Delta KCB.nên.\widehat{CKB}=\widehat{BAC}\right)\\ \Rightarrow\widehat{HKM}=90^0\Rightarrow HK\perp KM\)
S
30 tháng 8 2021
a) Xét tg ABC có AB=AC(gt)
=> tg ABC cân tại A=> B=C
Cách 1( tính chất Tg cân)
ta lại có AM là đường trung tuyến
tg ABC là tg cân => AM là dg cao => AH vg góc vs BC
Cách 2
Xét tg AHB và tg AHC có AH chung
AB=AC( tg ABC cân]
BH=HC( H td BC)
=> tg AHB=tg AHC ( c.c.c)=> AHB=AHC( hai góc bằng nhau)
Mà BHC= 180 độ=> AHB=AHC=180/2=90 độ
=>AH vg góc với BC
b)Ta có CP vg góc với BC (gt)
MN vg góc với BC( N là chân dg vuông góc)
=> MN// CP( từ vg góc đến song song)
Xét tg MCP và tg PNM có:
IMN=IPC( MN//CP; slt)
MN=CP( gt)
MP chung
=>tg MCP=Tg PMN (c.g.c)
C) Xét tg MIN và tg PIC có
IMN=IPC( MN//PC; slt]
MN=CP( gt)
MNI=IPC( MN//PC; slt)
=> tg MIN=tg PIC ( g.c.g)
=>NI=IC( 2 cạnh t/ứ)
tham khảo :
buổi sáng bán được :
3 / 20 nhân 60 = 9 ( chiếc xe máy )
bưởi chiều bán được :
2/17 nhân ( 60 -9 ) = 6 ( chiếc xe )
cả hai buổi bán dược là :
6+9 = 15 ( chiếc xe )
đáp số : 15 chiếc xe
tham khảo :
đổi 1/5 = 20%
giá tiền sau khi giảm là :
4000 ( nhân ) *1/5 = 8000 ( đồng )
Đ.số : 8000 đồng