(2n + 28)⋮(n + 3)
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1 interesting
2 natural
3 well
4 discussion
5 chilhood
6 dangerous
7 information
8 tourist
9 comfortable
10 cheaper
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Ex8
1 than
2 than
3 as
4 as
5 as
6 than
7 than
8 as
Ex9
2 A mile is farther than a kilometer
3 The sky blue is paler than a navy blue
4 A dolphin is cleverer than a snake
5 Gold is more valuable than silver
6 Yoga is more relaxing than football
7 Wind energy is cleaner than nuclear energy
8 A billionaire is richer than a millionaire
Ex10
1 from
2 peaceful
3 flowers
4 for
5 however
6 carpet
7 often
8 warer
9 path
10 fresh
Ex11
1 interesting
2 natural
3 well
4 discussion
5 childhood
6 dangerous
7 information
8 tourist
9 comfortable
10 cheaper
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a/
2020.2021=(2019+1)(2022-1)=
=2019.2022-2019+2022-1=2019.2022+2>2019.2022
b/
\(4^7=\left(2^2\right)^7=2^{14}< 2^{15}\)
c/
\(199^{20}< 200^{20}=\left(8.25\right)^{20}=\left(2^3.5^2\right)^{20}=2^{60}.5^{40}\)
\(2000^{15}=\left(16.125\right)^{15}=\left(2^4.5^3\right)^{15}=2^{60}.5^{45}\)
\(\Rightarrow2000^{15}=2^{60}.5^{45}>2^{60}.5^{40}>199^{20}\)
d/
\(31^{31}< 32^{31}=\left(2^5\right)^{31}=2^{155}\)
\(17^{39}>16^{39}=\left(2^4\right)^{39}=2^{156}\)
\(\Rightarrow17^{39}=2^{156}>2^{155}>31^{31}\)
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Ex6
1 to eat
2 any
3 to do
4 is going to visit
5 is driving
6 must
7 much
8 going
9 a
10 to have
11 many
12 dozen
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63 ⋮ \(x\); 2970 ⋮ \(x\) ⇒ \(x\) \(\in\) ƯC(63; 2970)
63 =7.32; 2970 = 2.32.5.11 ⇒ ƯCLN(63; 2970) = 32 = 9
⇒ \(x\) \(\in\) Ư(9)
9 = 32 ⇒ Ư(9) = {-9; - 3; -1; 1; 3; 9}
⇒ \(x\) \(\in\) {-9; -3; -1; 1; 3; 9}
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1. some - any
2. some - some
3. any
4. any - a
5. any - some
6. any
7. some - any
8. an - a
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- Nhật Bản đã có khoảng 125 đời vua từ thời kỳ Yamato vào thế kỷ thứ 7 đến khi hệ thống quân lính được thay bằng hệ thống quân chủ hiện đại vào năm 1868 nhé .
(2n + 28) ⋮ (n + 3) (n \(\ne\) -3)
(2n + 6 + 22) ⋮ (n + 3)
[2.(n + 3) + 22]⋮ (n + 3)
22 ⋮ (n + 30
(n + 3) \(\in\) Ư(22)
22 = 2.11 ⇒ Ư(22) = {-22; -11; -2; -1; 1; 2; 11; 22}
Lập bảng ta có:
Theo bảng trên ta có:
n \(\in\) {-25; -14; -5; -4; -2; -1; 8; 19}