Mn giúp mình với mình cần gấp 
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BH
1
DT
Đỗ Thanh Hải
CTVVIP
8 tháng 10 2021
1 How long do you live in HN
2 How often did you go to the movies
3 What did Mrs Robinson buy
4 When was your father in Nghe An
5 How do they go to school
6 Why didn't she go to class
7 Who left home at 7o'clock yesterday
8 What subject does he study in the high school
9 What is your favorite hobby
10 How far is it
TM
8 tháng 9 2021
a/ \(\left(x-3\right)^2+6\left(x-3\right)+9\)
\(=\left(x-3\right)^2+2.\left(x-3\right).3+3^2\)
\(=\left(x-3+3\right)^2=x^2\)
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b/ \(\left(x+2021\right)^2+2\left(x+2021\right)\left(x-2021\right)+\left(x-2021\right)^2\)
\(=\left(x+2021+x-2021\right)^2=4x^2\)
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c/ \(2022^2-2.2021.2022+2021^2\)
\(=\left(2022-2021\right)^2=1\)
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d/ \(\left(x+44\right)^2-88\left(x+44\right)+1936\)
\(=\left(x+44\right)^2-2.\left(x+44\right).44+44^2\)
\(=\left(x+44-44\right)^2=x^2\)
8 tháng 9 2021
d: Ta có: \(\left(x+44\right)^2-88\left(x+44\right)+1936\)
\(=\left(x+44-44\right)^2\)
\(=x^2\)
giúp mình với mn mình đang cần gấp
HH
6 tháng 11 2021
1. commuity service is work done by a person or group of people that benifits others
2. it is often done near the area where you live , so your own community gets the benifits work
3. no
4. community service can help many difference group of people , even animal and the inviroment
5. community service is often organized through a local group , such as a place of worship , school , or non- profit organization , or you can start your own community service project .
6.community service can even involve raising funds by donating used goods or selling used goods like clothing
VD
17 tháng 3 2022
\(\left(\dfrac{1}{1.3}+\dfrac{1}{3.5}+...+\dfrac{1}{13.15}\right).x=\dfrac{-26}{45}\\ \Leftrightarrow\left(\dfrac{2}{1.3}+\dfrac{2}{3.5}+...+\dfrac{2}{13.15}\right).x=\dfrac{-52}{45}\\ \Leftrightarrow\left(1-\dfrac{1}{3}+\dfrac{1}{3}-\dfrac{1}{5}+...+\dfrac{1}{13}-\dfrac{1}{15}\right).x=\dfrac{-52}{45}\\ \Leftrightarrow\left(1-\dfrac{1}{15}\right).x=\dfrac{-52}{45}\\ \Leftrightarrow\dfrac{14}{15}.x=\dfrac{-52}{45}\\ \Leftrightarrow x=-\dfrac{26}{21}\)
17 tháng 3 2022
(11.3+13.5+...+113.15).x=−2645⇔(21.3+23.5+...+213.15).x=−5245⇔(1−13+13−15+...+113−115).x=−5245⇔(1−115).x=−5245⇔1415.x=−5245⇔x=−2621
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
\(FeO+H_2\xrightarrow[]{t^o}Fe+H_2O\)
Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)=n_{H_2}=n_{Fe}\) \(\Rightarrow m_{Fe}=0,1\cdot56=5,6\left(g\right)\)