Giúp em với ạ, em cảm ơn 💗
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PQ
2
14 tháng 4 2021
a) Xét ΔMNI vuông tại M và ΔHPI vuông tại P có
\(\widehat{MIN}=\widehat{HIP}\)(hai góc đối đỉnh)
Do đó: ΔMNI\(\sim\)ΔHPI(g-g)
14 tháng 4 2021
b) Ta có: ΔMNI\(\sim\)ΔHPI(cmt)
nên \(\widehat{MNI}=\widehat{HPI}\)(hai góc tương ứng)
hay \(\widehat{MNI}=\widehat{MPK}\)
Xét ΔMNI vuông tại M và ΔMPK vuông tại M có
\(\widehat{MNI}=\widehat{MPK}\)(cmt)
Do đó: ΔMNI\(\sim\)ΔMPK(g-g)
Suy ra: \(\dfrac{MN}{MP}=\dfrac{MI}{MK}\)(Các cặp cạnh tương ứng tỉ lệ)
hay \(\dfrac{MN}{MI}=\dfrac{MP}{MK}\)
Xét ΔMNP vuông tại M và ΔMIK vuông tại M có
\(\dfrac{MN}{MI}=\dfrac{MP}{MK}\)(cmt)
Do đó: ΔMNP\(\sim\)ΔMIK(c-g-c)
DT
Đỗ Thanh Hải
CTVVIP
7 tháng 11 2021
7 friendly
8 traditionally
9 completely
10 compulsory
11 fashionab;e
12 modernized
13 friendly
14 convenient
TT
22 tháng 3 2021
Hello! John.
Glad to see you again. Tam, this is my cousin, Peter. It's his first to visit to your country.
How do you do? Welcome to VN
Thank you. Nice to meet you, Tam
Can I help you with your suitcases, John?
Thanks. I can manage.
OK. Now we're going to the hotel in the center of the city by taxi
That would be nice. How far is it from the airport to the center of the city?
It's about a half-hour drive
Look, John! What a lot of motorbikes in the streets!
Oh, yeah. That surprised me by the time I first came to VN
Motorbikes are our main means of transport. I go to school every day by bike.
Would you mind taking me around the city by bike?
No, of course not. But I have to ask someone else to get Peter, too
Peter, do you mind if Tam's friend gives us a ride around the city?
No, I don't mind. But I feel a little bit scared because the traffic is so heavy
OK. So we'll go on a sightseeing tour by bikes at weekend
25 tháng 4 2021
Câu 4:
4.1/ Ta có: \(n_{NaCl}=2,5.0,4=1\left(mol\right)\)
\(\Rightarrow m_{NaCl}=1.58,5=58,5\left(g\right)\)
4.2/ Ta có: \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
a, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
_____0,2___________0,2____0,2 (mol)
b, \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, \(m_{ZnCl_2}=0,2.136=27,2\left(g\right)\)
Bạn tham khảo nhé!
16 tháng 11 2021
a)\(R_{23}=R_2+R_3=2+4=6\Omega\)
\(R_{123}=\dfrac{R_1\cdot R_{23}}{R_1+R_{23}}=\dfrac{2\cdot6}{2+6}=1,5\Omega\)
\(R_{tđ}=R_4+R_{123}=4,4+1,5=5,9\Omega\)
\(I_m=\dfrac{\xi}{r+R_N}=\dfrac{12}{0,1+5,9}=2A\)
\(U_{AB}=2\cdot5,9=11,8V\)
b)\(I_4=I_{123}=I_m=2A\)
\(U_1=U_{23}=U_{123}=2\cdot1,5=3V\)
\(I_1=\dfrac{U_1}{R_1}=\dfrac{3}{2}=1,5A\)
\(I_2=I_3=I_{23}=\dfrac{U_{23}}{R_{23}}=\dfrac{3}{6}=0,5A\)
\(U_{AC}=U_4+U_2=I_4\cdot R_4+I_2\cdot R_2=2\cdot4,4+0,5\cdot2=9,8V\)
NV
Nguyễn Việt Lâm
Giáo viên
13 tháng 1 2021
\(\dfrac{2020}{2019}>\dfrac{2019}{2020}\Rightarrow0< a< 1\)
\(log_ba< 1\Rightarrow b>1\)
\(P=log_b^2a+log_b^22-\dfrac{m^2log_2b}{log_2a}+2\left(log_ba-2log_b2\right)-\dfrac{4^{ab^2}-2m.2^{ab^2}}{log_ba}\)
\(=log_b^2a+log_b^22+2log_ba-4log_b2-\dfrac{4^{ab^2}-2m.2^{ab^2}+m^2}{log_ba}\)
\(=\left(log_ba+1\right)^2+\left(log_b2-2\right)^2+\dfrac{\left(2^{ab^2}-m\right)^2}{-log_ba}-5\ge-5\)
Dấu "=" xảy ra khi: \(\left\{{}\begin{matrix}log_ba=-1\\log_b2=2\\2^{ab^2}=m\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a=\dfrac{1}{\sqrt{2}}\\b=\sqrt{2}\\m=2^{ab^2}=2^{\sqrt{2}}\end{matrix}\right.\)
Sau khi tính lại thì không có đáp án nào đúng :(
Dear Minh,
I just bought a new phone and wanted to show it off to you! I spent a lot of time researching and finally decided to choose Samsung Galaxy S23 Ultra. I use my phone to do everything, from taking photos, playing games, watching movies, to surfing the web and working. Galaxy S23 Ultra meets all my needs with a large 6.8 inch screen, 108MP camera that takes beautiful photos, powerful Snapdragon 8 Gen 2 chip and 5000mAh battery for all-day use. The phone has 12GB of RAM and 256GB of storage, enough for me to store all my favorite photos, videos, and apps. Its price is quite high, about 30 million VND, but I think it's worth it for the features it brings. I am very satisfied with this new phone and believe that it will accompany me for many years to come. You can come to the store to try it out!
Love,
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