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0
NV
Nguyễn Việt Lâm
Giáo viên
2 tháng 8 2021
\(\dfrac{3^7.8^3}{6^5.12^2}=\dfrac{3^7.\left(2^3\right)^3}{\left(2.3\right)^5.\left(2^2.3\right)^2}=\dfrac{3^7.2^9}{2^5.3^5.2^4.3^2}=\dfrac{3^7.2^9}{3^7.2^9}=1\)
\(\dfrac{15^3+3.15^2+5^2.3^3}{7.5.3^3}=\dfrac{3^3.5^3+3.3^2.5^2+3^3.5^2}{7.5.3^3}=\dfrac{5.3^3\left(5^2+5+5\right)}{7.5.3^3}=\dfrac{25+5+5}{7}=5\)
2 tháng 8 2021
c) \(\dfrac{3^7\cdot8^3}{6^5\cdot12^2}=\dfrac{3^7\cdot2^9}{2^5\cdot3^5\cdot3^2\cdot2^4}=1\)
d) \(\dfrac{15^3+3\cdot15^2+5^2\cdot3^3}{7\cdot5\cdot3^3}=\dfrac{15^3+3\cdot15^2+15^2\cdot3}{7\cdot5\cdot3^3}\)
\(=\dfrac{15^2\cdot\left(15+6\right)}{7\cdot5\cdot3^3}=\dfrac{3^3\cdot5^2\cdot7}{7\cdot5\cdot3^3}=5\)
DT
Đỗ Thanh Hải
CTVVIP
27 tháng 5 2021
Question I
1 C
2 A
3 D
4 C
Question II
1 B
2 C
3 B
4 A
5 B
6 D
7 A
8 B
Question III
1 A
2 B
3 C
4 C
Question IV
1 plays
2 goes
3 goes
4 listens
5 watches
6 plays
7 goes
8 plays
QuestionV
1 He stayed at home because he was sick
2 It was very cold but they went swimming
3 We can go camping or we can go for a picnic
4 He didn't wash his hands so he had a stomachache
Question VI
1 They give away warm clothes to homeless people in Ha Noi.
2 We haven't had a vacation since last year
Queston VII
1 riding
2 went
3 have lived
4 take
Câu trả lời:
14 F
15 T
16 T
17 F
18 T
Part II
20 It is getting higher and higher
21 I should turn off all the lights before going out
C
22 Renewable energy will be used in the future
23 This school is ours
24 Solar energy will be used by many countries in the world
25 How will you travel from one place to another?
26 We will reduce the use of electricity to save energy
14F
15T
16T
17T
18F
19T