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Những câu hỏi liên quan
LT
20 tháng 10 2021
1)xét tứ giác EACD
EA//DC,ED//AC
=>EACD hình bình hành
E=C=40(hai góc đối)
ta có DAC=BAC/2=60/2=30(AD là tia pg)
mà ED//AC
=>ADE=DAC=30(so le)
xét tg EAD
E+ADE+EAD=180
EAD=180-ADE-E=180-30-40=110
2)
a)xét tgAHB và tgDHB
BAH=BDH=90,ABH=HBD(BH là tia pg),BH chung
=>tgAHB=tgDHB(cạnh huyền góc nhọn)
=>AH=HD,BA=BD
b)xét tg BDE và tgBAC
BA=BD,ABC chung,BAC=BDE=90
=>tgBDE=tgBAC(gcg)
=>BE=BC
xét tg BEC
BA/BE=BD/BC=>AD//EC(ta lét đảo)
AT
1
DT
Đỗ Thanh Hải
CTVVIP
3 tháng 8 2021
14 have just cleaned
15 have you had - had
16 have you been - spent - did you have - stopped
17 will you go - will go
18 will get
19 Areyou going to do - am going
20 is going to rain
21 Will - have
22 will telephone
23 will send
24 will learn
25 Are you going to do
GA
1
10 tháng 12 2021
\(f\left(-2\right)=3.\left(-2\right)^2-1=3.4-1=11\\ f\left(\dfrac{1}{2}\right)=3.\left(\dfrac{1}{2}\right)^2-1=3.\left(\dfrac{1}{4}\right)-1=\dfrac{3}{4}-1=-\dfrac{1}{4}\\ f\left(\dfrac{-2}{\sqrt[]{3}}\right)=3.\left(\dfrac{-2}{\sqrt[]{3}}\right)^2-1=3.\left(\dfrac{4}{3}\right)-1=4-1=3\\ f\left(a+1\right)=3.\left(a+1\right)^2-1=3.\left(a^2+2a+1\right)-1=3a^2+6a+3-1=3a^2+6a+2\)
PL
0
DH
1
18 tháng 10 2021
biết \(NTK_{Ca}=40\left(đvC\right)\)
vậy \(PTK\) của hợp chất \(=2.40=80\left(đvC\right)\)
ta có:
\(1.Z+3O=80\)
\(Z+3.16=80\)
\(Z+48=80\)
\(Z=80-48=32\left(đvC\right)\)
\(\Rightarrow Z\) là \(S\) (lưu huỳnh)
GK
2
GL
14 tháng 6 2023
1. Tom said he wanted to buy a pocket calculator for his father
2. My mother said she thought it wouldn't rain the next day
3. The nurse said the patient in that room hadn't obeyed doctor's orders
4. They said they couldn't meet me there either that day or the next day
5. Mr.Brown said their trip costed them two thousand dollars
6. He said to her that he couldn't find his hat anywhere in that room
7. My father said to them that his secretary was going to finish that job
14 tháng 6 2023
1. Tom said: “I want to buy a pocket calculator for my father.”
.....................Tom said that he wanted to buy a pocket calculator for his father...........................................................................................
2. My mother said : “I think it won’t rain tomorrow.”
......................My mother said that she thought it wouldn't rain the following day...........................................................................................
3. The nurse said: “The patient in this room didn’t obey your orders, doctor.”
......................The nurse said to the doctor that the patient in that room hadn't obeyed his orders ...........................................................................................
4. They said : “We can’t meet you here either today or tomorrow.”
............They said that they couldn't meet me there either today or tomorrow(tham khảo c4).....................................................................................................
5. Mr. Brown said : “Our trip cost us two thousand dollars.”
.......................Mr. Brown said that their trip cost them two thousand dollars(tham khảo c5).........................................................................................
6. He said to her : “ I can’t find my hat anywhere in this room.”
..............He said to her that he couldn't find his hat anywhere in that room..................................................................................................
7. My father said to them : “My secretary is going to finish this job.”
My father said to them that his secretary was going to finish that job
CK
1
5 tháng 1 2022
b: Tọa độ giao điểm là:
\(\left\{{}\begin{matrix}2x+1=x-2\\y=x-2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=-3\\y=-5\end{matrix}\right.\)
TH
25 tháng 10 2021
Cách ra nha bn ! Vs lại bài 3 hình ko cho độ thì lm sao mà lm đc đây?
