giúp tớ với sắp nộp r :(((((
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1. C
2. D
3. D
4. C
5. C
6. C
7. A
8. C
9. C
10. D
11. B
12. B
13. A
14. A
15. D
16. D
17. C
18. D
19. B
20. C
1c
Âm /d/ còn lại âm /t/
2d
Âm /d/ còn lại âm /t/
3d
Âm /t/ còn lại âm /d/
4c
Âm /t/ còn lại âm /d/
5c
Âm /id/ còn lại âm /d/
6c
Âm /t/ còn lại âm /d/
7a
Âm /d/ còn lại âm /id/.
8 A- B âm /t/, C - D âm /d/
9c
Âm /t/ còn lại âm /d/
10d
Âm /t/ còn lại âm /id/
11b
Âm /t/ còn lại âm /id/
12b
Âm /t/ còn lại âm /d/
13a
Âm /d/ còn lại âm /t/
14a
Âm /t/ còn lại âm /d/.
15d
Âm /d/ còn lại âm /id/
16d
Âm /t/ còn lại âm /d/
17 c
Âm /d/ còn lại âm /id/
18d
Âm /d/ còn lại âm /t/
19b
Âm /id/ còn lại âm /d/
20c
Âm /t/ còn lại âm /id/
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Cách phát âm đuôi -ed:
Âm /t/: Khi âm tận cùng trước nó có âm /s/, /ʧ/, /ʃ/, /k/, /p/, /f/
Âm /id/: Khi âm tận cùng trước nó có âm /t/, /d/
Âm /d/: Các từ có âm tận cùng còn lại.
\(Errink \times Cream\)
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CTHH | Số nguyên tử của mỗi nguyên tố trong 1 phân tử | Phân tử khối |
SO3 | 1S,3O | 80 |
AgNO3 | 1Ag,1N,3O | 170 |
Na2SO4 | 2Na,1S,4O | 142 |
MgSO4 | 1Mg,1S,4O | 120 |
KMnO4 | 1K,1Mn,4O | 158 |
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a: Ta có: \(3\left(x-2\right)^2+\left(x-1\right)^3-x^3=-7\)
\(\Leftrightarrow3x^2-12x+12+x^3-3x^2+3x-1-x^3=-7\)
\(\Leftrightarrow-9x=-18\)
hay x=2
b: ta có: \(\left(x+2\right)^3-x\left(x-1\right)\left(x+1\right)=6x^2-5x+3\)
\(\Leftrightarrow x^3+6x^2+12x+8-x^3+x-6x^2+5x-3=0\)
\(\Leftrightarrow17x=-5\)
hay \(x=-\dfrac{5}{17}\)
c: Ta có: \(\left(2x-1\right)^3+12\left(x-1\right)\left(x+1\right)=14x-13\)
\(\Leftrightarrow8x^3-12x^2+6x-1+12x^2-12-14x+13=0\)
\(\Leftrightarrow8x^3-8x=0\)
\(\Leftrightarrow8x\left(x-1\right)\left(x+1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=1\\x=-1\end{matrix}\right.\)
a) \(3\left(x-2\right)^2+\left(x-1\right)^3-x^3=-7\)
\(\Rightarrow3x^2-12x+12+x^3-3x^2+3x-1-x^3=-7\)
\(\Rightarrow-9x=-18\)
\(\Rightarrow x=2\)
b) \(\left(x+2\right)^3-x\left(x-1\right)\left(x+1\right)=6x^2-5x+3\)
\(\Rightarrow x^3+6x^2+12x+8-x^3+x=6x^2-5x+3\)
\(\Rightarrow18x=-5\)
\(\Rightarrow x=-\dfrac{5}{18}\)
c) \(\left(2x-1\right)^3+12\left(x-1\right)\left(x+1\right)=14x-13\)
\(\Rightarrow8x^3-12x^2+6x-1+12x^2-12=14x-13\)
\(\Rightarrow8x^3-8x=0\)
\(\Rightarrow8x\left(x-1\right)\left(x+1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x=1\\x=-1\end{matrix}\right.\)
1. shouldn't
2. should
3. should
4. should
5. should
6. Should
7. should
8. shouldn't
9. should
10. should
11. shouldn't
12. Should
13. should
14. shouldn't
15. shouldn't
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II
1. was -> were
2. Was -> Were
3. was -> did
4. went -> go
5. weren't -> didn't
6. have -> had
7. broke -> break
8. go -> went
9. am -> was
10. turn -> turned
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III
1. taught/ to ride/ was
2. does your father go/ drives
3. are going
4. used/ lived
5. spent/ repairing
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IV
1. Lang Lieu couldn't buy any special food because he was very pool
2. During Tet, Vietnamese people buy all kinds of sweets, so they make Chung cakes as well
3. The Hung King Temple Festival was a local festival. However, it has become a public holiday in Viet Nam
4. At the Mid-Autumn festival, kids can sing, dance and enjoy moon cakes; therefore, every child like it very much.
5. Because the water is highly polluted, we can't swim in this part of the river
6. Mr. Minh is admired since he dedicates all his life to protecting the environment
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V
1. A
2. B
3. A
4. D
5. C