13 I've won an essay contest. - (Congratulations!/ It's interesting/Oh poor!)
14 Physical changes are different for every, so you don't need to feel embarrased or (frustrated/tense/confident)
15 Would you like to go to the cinema? (how cool!/sure/ I can't imagine that)
16 The doll has been (embroidered/cast/woven/mounded) out of clay
17 We invited her to the party but she (set up/turned down/pass down)
18 Choose the word which has a different stress pattern (contestant/remote/proper)
19 We can't decide (where/what/which) to go for our vacation
20 I couldn't concentrate on my lesson (although/so that/because) I was very tense
21 He started to learn how to (embroider/weave/cast) a statue in bronze
22 Hue's conical hats always have two (layers/frames/poems) of leaves
23 These cars are (lots smaller/much smaller/more smaller) than those ones
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\(\left|31-17\right|-\left|13-57\right|=\left|14\right|-\left|-44\right|=14-44=-30\)
\(A=\dfrac{13^{15}+1}{13^{16}+1}\)
\(\Leftrightarrow13A=\dfrac{13^{16}+13}{13^{16}+1}=1+\dfrac{12}{13^{16}+1}\)
\(B=\dfrac{13^{16}+1}{13^{17}+1}\)
\(\Leftrightarrow13B=\dfrac{13^{17}+13}{13^{17}+1}=1+\dfrac{12}{13^{17}+1}\)
mà \(13^{16}+1< 13^{17}+1\)
nên A>B
a)15.12-3.5.10
cách 1:
15.12-3.5.10= 15. 12- 15. 10
= 15.( 12-10)= 15.2= 30
cách 2:
15.12-3.5.10= 3.5 .12 -3.5.10= 3.(5.12- 5.10)= 3.( 60-50)
=3.10=30
a) Cách 1: 15.12 - 3.5.10 = 180 - 150
= 30
Cách 2 : 15.12 - 3.5.10 = 15.12 - ( 3.5 ) .10
= 15.12 - 15.10
= 15. ( 12 - 10 )
= 15.2
= 30
b) Cách 1 : 45 - 9.( 13 + 5 ) = 45 - 9.18
= 45 - 162
= -117
Cách 2 : 45 - 9.( 13+ 5 ) = 9.5 - 9.18
= 9.( 5 - 18 )
= 9. ( -13 )
= -117
c) Cách 1 : 29.( 19 - 13 ) - 19.( 29 - 13 ) = 29.6 - 19.16
= 174 - 304
= -130
Cách 2 : 29.( 19 - 13 ) - 19.( 29 - 13 )
= 29.19 - 29.13 - 19.29 + 19.13
= 19.13 - 29.13
= ( 19 - 29 ).13
= (-10) .13
= -130
16.19
=16.(20-1)
=320-16
=304
46.99
=46.(100-1)
=4600-46
=4554
35.98
=35.(100-2)
=3500-70
=3430
16.(20-1)=320-16=304
46.(100-1)=4600-46=4554
35.(100-2)=3500-70=3430
a) 15 . 12 - 3 . 5 .10
= 15 . 12 - 15 . 10
= 15 ( 12 - 10)
= 15 . 2
= 30
b) 45 - 9 . ( 13 + 5 )
= 9 . 5 - 9. ( 13 + 5)
= 9 . [ 5 - ( 13 + 5)]
= 9 . [5 - 13 -5 ]
= 9 . (-13)
= -117
c) 29 . ( 19 - 13 ) - 19 . ( 29 - 13 )
= 29 . 19 - 29 . 13 - 19 . 29 + 19 . 13
= 29 . 13 - 19 . 13
= - 13. ( 29 -19 )
= - 13. 10
= - 130
~ Học tốt
# Chiyuki Fujito
a) 15.12-3.5.10
= 15.12-15.10
= 15.(12-10)
= 15.2
= 30
b) 45-9.(13+5)
= 45-9.18
= 45-162
= -117
c) 29.(19-13)-19.(29-13)
= 29.6-19.16
= 174-304
= -130
13. I enjoy listening to pop music best.
à Pop music is my ……favorite kind of music………………………
14. They didn’t go camping yesterday because it rained heavily.
- It ……rained heavily so they didn't go camping yesterday…………………………
15. I started playing soccer 5 years ago.
à I have.......played soccer for 5 years.........................
16.Jack is 13 years old and my son is,too.
à Jack is ……the same age as my son…………
17. Mary was sick, so she could not go to school.
→ Because ………Mary was sick, she could not go to school………………
18. The last time I met him was 3 years ago
→ I haven’t ………met him for 3 years……………………….
19. Lan went out because she finished her homework.(so)
→ Lan …had finished her homework so she went out……………………………………
20. He is interested in doing morning exercise.
→ He enjoys ……doing morning exercise.………………………………………
21. We have learned English for 3 years.
→ We started ……learning E 3 years ago………………………………
22. We started to live here in 2012.
→ We have ........lived here since 2012..............................................
23. Her book is not the same as mine.
→ Her book is......different from mine....................................
24. You should walk around the Old Quarter at night.
→ It’s a good idea to.......... walk around the Old Quarter at night............................
1. Pop music is my favorite kind of music.
2. It rained heavily yesterday so they didn't go camping.
3. I have played playing soccer for 5 years.
4. Jack is the same age as my son.
5. Because Mary was sick, she could not go to school.
6. I haven't met him for 3 years.
7. Lan finished her homework, so she went out.
8. He enjoys doing morning exercise.
9. We started to learn English for 3 years.
10. We have lived here since 2012.
11. Her book is different from mine.
12. It's a good idea to walk around the Old Quarter at night.
\(\Leftrightarrow\orbr{\begin{cases}2x-5=13\\2x-5=-13\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}2x=13+5\\2x=-13+5\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}2x=18\\2x=-8\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=18:2\\x=-8:2\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=9\\x=-4\end{cases}}\)
vậy \(x\in\left\{-4;9\right\}\)
| 2x - 5| = 13
TH1: 2x - 5 = 13
2x = 13 +5
2x = 18
x = 18:2
x = 9
TH2: 2x - 5 = -13
2x = ( -13) + 5
2x = -8
x = (-8) : 2
x = -4
KL: x = 9, hoặc x = -4
13. Congratulations!
14. frustrated
15. Sure
16. Moulded
13 I've won an essay contest. - (Congratulations!/ It's interesting/Oh poor!)
14 Physical changes are different for every, so you don't need to feel embarrased or (frustrated/tense/confident)
15 Would you like to go to the cinema? (how cool!/sure/ I can't imagine that)
16 The doll has been (embroidered/cast/woven/mounded) out of clay
17 We invited her to the party but she (set up/turned down/pass down)
18 Choose the word which has a different stress pattern (con'testant/'remote/'proper)
19 We can't decide (where/what/which) to go for our vacation
20 I couldn't concentrate on my lesson (although/so that/because) I was very tense
21 He started to learn how to (embroider/weave/cast) a statue in bronze
22 Hue's conical hats always have two (layers/frames/poems) of leaves
23 These cars are (lots smaller/much smaller/more smaller) than those ones
23.smaller