Giúp em với em cần gấp ah 
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Khách
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PN
1
5 tháng 3 2022
a: Xét ΔCDA vuông tại A và ΔCBA vuông tại A có
CA chug
DA=BA
Do đó:ΔCDA=ΔCBA
b: Ta có: ΔCDB cân tại C
mà CA là đường cao
nên CA là đường phân giác
c: Xét ΔCEI vuông tại E và ΔCFI vuôg tại F có
CI chung
\(\widehat{ECI}=\widehat{FCI}\)
Do đó:ΔCEI=ΔCFI
Suy ra: CE=CF
Xét ΔCDB có CE/CD=CF/CB
nên EF//DB
11 tháng 8 2021
1, If we recycled, we will save natural resources
2,If you don't be careful, you will be fall over rocks
3,If you work too much, you will feel tired
4,If you are careless, you will broke the vase
5,If Ha has work to hard, she can pass the exam
b)
1,If I knew the answer, I could give you
2,If you chose that job, you would pay for it
3, If Mrs Green had money, she could afford the house
4,If you had a pen, you could written down the address
5,If she was a president, she would change the law
c)
1, If If Jerry had understood the lesson, he would have answered
2,If Carol hadn't studied, she would have answered
3,If he had worked hard, he wouldn't have been fired
4,If I had been stucked in the traffic jam, I wouldn't have been late
5,If he hadn't gone out in the rain last night, he wouldn't have had a flu
DN
1
AH
Akai Haruma
Giáo viên
29 tháng 12 2023
Lời giải:
Bổ sung điều kiện $x$ nguyên.
Ta có:
$2x+7\vdots x-2$
$\Rightarrow 2(x-2)+11\vdots x-2$
$\Rightarrow 11\vdots x-2$
$\Rightarrow x-2\in \left\{1; -1; 11; -11\right\}$
$\Rightarrow x\in \left\{3; 1; 13; -9\right\}$
N
1
7 tháng 11 2021
\(\Leftrightarrow\left(x-2021\right)\left(x-5\right)-\left(x-2021\right)=0\\ \Leftrightarrow\left(x-2021\right)\left(x-6\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=2021\\x=6\end{matrix}\right.\)
14 tháng 6 2020
[ 48 phut 36 giay : 9 ] + 9,54 phut = 5phut 24 giay + 9,54 phut = 5,4 phut + 9,54 phut = 14,94 phut
C D B B C A A D C
do
to be
were waiting
went-wouldn't be
were
smoking
is always leaving
to study
haven't spoken
arrive