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DT
1
O
25 tháng 3 2022
a) \(\dfrac{3}{4}+\dfrac{9}{5}\div\dfrac{3}{2}-1=\dfrac{3}{4}+\dfrac{18}{15}-1=\dfrac{39}{20}-1=\dfrac{19}{20}\)
b) \(\dfrac{6}{7}\cdot\dfrac{8}{13}+\dfrac{6}{13}\cdot\dfrac{9}{7}-\dfrac{4}{13}\cdot\dfrac{6}{7}=\dfrac{48}{91}+\dfrac{54}{91}-\dfrac{24}{91}=\dfrac{48+51-24}{91}=\dfrac{78}{91}=\dfrac{6}{7}\)
c) \(\dfrac{-3}{7}+\left(\dfrac{3}{-7}-\dfrac{3}{-5}\right)\)\(=\dfrac{-3}{7}+\left(\dfrac{-3}{7}-\dfrac{-3}{5}\right)=\dfrac{-3}{7}+\dfrac{6}{35}=-\dfrac{9}{35}\)
83
2
S
16 tháng 1 2022
PTHH : 2Al + 6HCl --> 2AlCl3 + 3H2 ↑ (1)
nAlCl3 = \(\dfrac{m}{M}=\dfrac{13,35}{27+35,5.3}=0.1\left(mol\right)\)
Từ (1) => nHCl = 2nH2 = 0.2 (mol)
=> mHCl = n.M = 0.2 x 36.5 = 7.3 (g)
16 tháng 1 2022
\(PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\\ n_{AlCl_3}=\dfrac{m}{M}=\dfrac{13,35}{133,5}=0,1\left(mol\right)\\ Theo.PTHH:n_{HCl}=3.n_{AlCl_3}=3.0,1=0,3\left(mol\right)\\ m_{HCl}=n.M=0,3.36,5=10,95\left(g\right)\)
30 tháng 12 2021
1: \(\overrightarrow{AB}=\left(-3;-1\right)\)
\(\overrightarrow{AC}=\left(1;2\right)\)
DN
16 tháng 12 2021
1. They walk along the beach and collect all rubbish.
2. How many tomatoes do you need to make the sauce?
3. My sister does aerobics three times a week to keep fit.
4. Sydney is the most beautiful and the cleanest city in the world.
5. There are eighteen thousand students studying at universary.
Mình làm vậy cũng chả biết đúng ko nữa nên bạn đợi kết quả của ng khác rồi làm nha =))
19 tháng 8 2021
35.Tom has not read this book before
36.Have you ever joined such a big party?
28 tháng 9 2021
1.B
2.A
3.-nhân dân,siêu nhân
-nhân từ,nhân đạo,nhân hậu
-đối với em bố em là siêu nhân .
-cô giáo em là một người nhân từ.
1 tháng 11 2021
a: AC=12(cm)
\(\sin\widehat{C}=\dfrac{9}{15}=\dfrac{3}{5}\)
\(\Leftrightarrow C=37^0\)
\(\Leftrightarrow\widehat{B}=53^0\)
Rewrite the following sentences with the same meaning of the given ones.
1. I bought a new notebook on the way to school (stopped)
→ I stopped on the way to school to buy a new notebook.
2. We're staying in Milan for a night before flying home (planning)
→ We're planning to stay in Milan for a night before flying home.
3. I don't want to cook tonight - let's have a take away (feel)
→ I don't feel like cooking tonight - let's have a take away.
4. Could you ask Francis to come into my offiice, please ? (mind)
→ Do you mind asking Francis to come into my office, please?
5. I don't think it's likely that you will win the competition (chance)
→ There is a chance that you won't win the competition.
6. They'll show Titan at the cinema and they'll release the DVD (before)
→ They'll release the DVD before showing Titan at the cinema.
7. I'll finish marking the exam and then I'll tell you tour results (soon)
→ Soon, I'll finish marking the exam and tell you your results.
8. I saw the film and then I read the book (after)
→ After I saw the film, I read the book
9. My parent wouldn't let me stay out late when I was young (used to )
→ When I was young, my parents used to not let me stay out late.
10. Daren thinks that wearing a suit to work is appropriate (likes)
→ Daren likes to wear a suit to work and thinks it is appropriate.