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a) Ta có (am)n = am.am...am (định nghĩa) (có n thừa số am)
= am + m + .... + m (có n hạng tử m)
= am.n (đpcm)
b) Ta có 5333 = 53.111 = (53)111 = 125111
3555 = 35.111 = (35)111 = 243111
Nhận thấy 125 < 243
=> 125111 < 243111
=> 5333 < 3555
b) Ta có 2400 = 24.100 = (24)100 = 16100
4200 = 42.100 = (42)100 = 16100
=> 2400 = 4200 (= 16100)
1.1.goes
2. Are you writting
3.haven't cleaned
2.1 Where are they planting the tree ?
2. When will she visit hanoi ?
3. When does she often watch TV ?
4.How often do you go to school ?
5. How are all the buildings in London ?
6. What is the weather in sweden in winter ?
7.Where was your father last month ?
8. Why did she go to the doctor ?
9. What time did Nam leave home yesterday ?
10. Where will be your future house ?
11. How often does she go to the fitness center ?
12. When did they join the environment project ?
13. What subject does your class have on monday ?
14. Where will you travel by a super carr ?
\(\left|2x-1\right|=\left(-4\right)^2\)
\(\left|2x-1\right|=16\)
\(\Rightarrow\orbr{\begin{cases}2x-1=16\\2x-1=-16\end{cases}\Rightarrow\orbr{\begin{cases}2x=17\\2x=-15\end{cases}\Rightarrow}\orbr{\begin{cases}x=8,5\\x=-7,5\end{cases}}}\)
vậy....................
a) Cách 1: \(\left(3^2\right)^3=3^{2.3}=3^6\)
\(\left(3^3\right)^2=3^{3.2}=3^6\)
\(\left(3^2\right)^5=3^{2.5}=3^{10}\)
\(9^8=\left(3^2\right)^8=3^{2.8}=3^{16}\)
\(27^6=\left(3^3\right)^6=3^{3.6}=3^{18}\)
\(81^{10}=\left(3^4\right)^{10}=3^{4.10}=3^{40}\)
Cách 2: \(\left(3^2\right)^3=9^3\)
\(\left(3^3\right)^2=3^{3.2}=\left(3^2\right)^3=9^3\)
\(\left(3^2\right)^5=9^5\)
\(9^8\)
\(27^6=\left(3^3\right)^6=3^{3.6}=3^{18}=3^{2.9}=\left(3^2\right)^9=9^9\)
\(81^{10}=\left(9^2\right)^{10}=9^{2.10}=9^{20}\)
Trả lời :
b)
Ta có : \(5^{28}=5^{2.14}=\left(5^2\right)^{14}=25^{14}< 26^{14}\)
\(\Rightarrow5^{28}< 26^{14}\)
Sai gần hết
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