Giúp mk bài II)
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1 have been working
2 arrived
3 was told
4 was
5 was
6 asked
7 said
8 hadn't been
9 had
10 keeping
11 walked
12 will have participated
13 haven't met
14 wondered
15 had heard
16 asked
17 had done
18 said
19 had dropped
20 looked
1 D (phát âm là id còn lại là d)
2 C (phát âm là k còn lại là ch)
3 B (câm còn lại đọc là b)
4 A (đọc là g còn lại là z)
Tiện thể giải thích cho hết luôn đây
II,
1D (/t/ còn lại theo nhóm các âm ko theo qt)
2C (/c/ còn lại là /ch/)
3B (âm câm, còn lại là /b/)
4A (/g/ còn lại là /z/)
III,
1D: cấu trúc spend+V-ing
2A: cụm từ native speakers
3C: thì quá khứ hoàn thành tiếp diễn
4D: lời khen và lời cảm ơn
ChooseA, B, C, D for each gap in the following sentences 3. Osaka has become one of the...........“liveable" city in Asia. A. more B. betterC. much D. most 4.The traditional craft hasfrom generation to generation.A. passed down B. passedC. been passed down D. been passed by 5.The Van Phuc producers silk have expanded their silk garment goods they can satisfy the varied demand for their silk. A. in order to B. despiteC. because D. so that 6. ___________ they moved to the city five years ago, they still remember living in a small town. A. Although B. WhereasC. While D. In order that 7.This company has gone bankrupt. Do you know who will_________ ? A. take care of it B. look after itC. take it over D. turn it up 8.The people in my village cannot earn enough money for their daily life. They can't______ this traditional craft. They have to find other jobs. A. help outB. live onC. work onD. set up 9 .Peter and Jane said to me: “Our wedding will be held next week”. A.Peter and Jane said to me that my wedding would be held next week. B.Peter and Jane said to me that their wedding would be held the next week. C.Peter and Jane said to me that their wedding would be held the following week D. Peter and Jane said me that their wedding would be held the following week
Lời giải:
a. Khi $m=-4$ thì hpt trở thành:
\(\left\{\begin{matrix} 2x+y=-14\\ x-y=5\end{matrix}\right.\Leftrightarrow \left\{\begin{matrix} x=-3\\ y=-8\end{matrix}\right.\)
b.
PT $(2)\Leftrightarrow x=y+5$
Thay vô PT(1):
$2(y+5)+y=3m-2$
$\Leftrightarrow 3y+10=3m-2$
$\Leftrightarrow 3y=3m-12$
$\Leftrightarrow y=m-4$
$x=y+5=m+1$
Vậy hpt có nghiệm $(x,y)=(m+1, m-4)$
Để $x+y=13$
$\Leftrightarrow m+1+m-4=13$
$\Leftrightarrow 2m-3=13$
$\Leftrightarrow m=8$
Bài 1:
Gọi A là kim loại hóa trị II cần tìm
\(n_{H_2}=\dfrac{0,28}{22,4}=0,0125\left(mol\right)\\ A+2HCl\rightarrow ACl_2+H_2\\ n_A=n_{H_2}=0,0125\left(mol\right)\\ M_A=\dfrac{0,3}{0,0125}=24\left(\dfrac{g}{mol}\right)\)
Vậy: Kim loại A(II) cần tìm là Magie (Mg=24)
Bài 2:
- Chỉ có Zn tác dụng với dd HCl dư chứ Cu thì không.
\(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ n_{Zn}=n_{H_2}=0,2\left(mol\right)\\ \rightarrow m_{Zn}=0,2.65=13\left(g\right)\\ \rightarrow m_{Cu}=15-13=2\left(g\right)\\ Vậy:m=2\left(g\right)\)
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