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1, \(81\cdot27^3\cdot243^5=3^4\cdot3^9\cdot3^{25}=3^{38}\)
2,\(25^4\cdot125^3\cdot625^7=5^8\cdot5^9\cdot5^{28}=5^{45}\)
3,
\(16^3\cdot8^9\cdot64^5\cdot1024=2^{12}\cdot2^{27}\cdot2^{30}\cdot2^{10}=2^{79}\)
a)\(3^2.3^x=243\)
\(3^2.3^x=3^5\)
\(3^x=3^5:3^2\)
\(3^x=3^3\)
\(\Rightarrow x=3\)
b)\(2^x.16^2=1024\)
\(2^x.\left(2^4\right)^2=2^{10}\)
\(2^x.2^8=2^{10}\)
\(2^x=2^{10}:2^8\)
\(2^x=2^2\)
\(\Rightarrow x=2\)
Học tốt nha^^
3^2.3=243 vậy x=3
2^x.16^2=1024 vậy x=2
64.4^x=16^8 vậy x=13
2^x-26=6 vậy x=5
phần cuối đề sai
\(=2^{16}:2^8=2^8\)
\(8^{^4}:16^5=2^{16}:2^{20}=\frac{1}{16}\)
\(=3^{10}.3^9.3^5=3^{24}\)
\(=2^6.3^3.3^3.3^2.2^2=2^8.3^8\)
a)\(16^4:2^8=\left(2^4\right)^4:2^8=2^{16}:2^8=2^8\)
b)\(8^4.16^5=\left(2^3\right)^4.\left(2^4\right)^5=2^{12}.2^{20}=2^{32}\)
c)\(9^5.27^3.243=\left(3^2\right)^5.\left(3^3\right)^3.3^5=3^{10}.3^9.3^5=3^{24}\)
d)\(12^3.3^3.6^2=\left(2^2.3\right)^3.3^3.2.3=2^6.3^3.3^3.2.3=2^6.2.3^3.3^3.3=2^7.3^7=\left(2.3\right)^7=6^7\)
Chúc bạn học tốt
a)
\(3^4.3^n:9=3^7\)
\(\Rightarrow3^4.3^n=3^7.9\)
\(\Leftrightarrow3^4.3^n=3^7.3^2\)
\(\Rightarrow3^4.3^n=3^9\)
\(\Rightarrow3^n=3^9:3^4\)
\(\Rightarrow3^n=3^5\)
\(\Rightarrow n=5\)
Vậy \(n=5\)
d)
\(2^n:4=16\)
\(\Leftrightarrow2^n:2^2=2^4\)
\(\Rightarrow2^n=2^4.2^2\)
\(\Rightarrow2^n=2^6\)
\(\Rightarrow n=6\)
Vậy \(n=6\)
a) \(2^n:4=16\)
\(2^n:2^2=2^4\)
\(=>n-2=4\)
\(=>n=6\)
b) \(3^n:3^2=243\)
\(3^n:3^2=3^5\)
\(=>n-2=5\)
\(=>n=7\)
vay \(n=7\)
c) \(2^n-64=2^6\)
\(2^n-2^6=2^6\)
\(2^n=2^6+2^6\)
\(2^n=128\)
\(2^n=2^7\)
\(=>n=7\)
vay \(n=7\)
a) \(9< 3^x< 243\)
\(\Leftrightarrow3^2< 3^x< 3^5\)
\(\Rightarrow x\in\left\{3;4\right\}\)
b) Sửa đề: \(3^4.3^x\div9=27\)
\(\Leftrightarrow3^{x+4}=3\)
\(\Rightarrow x+4=1\)
\(\Rightarrow x=-3\)
c) \(3^x\div3^2=243\)
\(\Leftrightarrow3^{x-2}=3^5\)
\(\Rightarrow x-2=5\)
\(\Rightarrow x=7\)
d) \(25< 5^x< 3125\)
\(\Leftrightarrow5^2< 5^x< 5^5\)
\(\Rightarrow x\in\left\{3;4\right\}\)
e) \(2^x-64=2^6\)
\(\Leftrightarrow2^x=64+64=128\)
\(\Leftrightarrow2^x=2^7\)
\(\Rightarrow x=7\)
f) \(2^x\div16=128\)
\(\Leftrightarrow2^x=2^7.2^4\)
\(\Leftrightarrow2^x=2^{11}\)
\(\Rightarrow x=11\)
a)6254 . 257=258.257=2515
b)813 . 2435=312.325=337
c)643 . 812=86.812=818
a) \(\left(x-6\right)^3=\left(x-6\right)^2\Leftrightarrow\orbr{\begin{cases}x-6=1\Leftrightarrow x=7\\x-6=0\Leftrightarrow x=6\end{cases}}\)
b) \(\left(7.x-11\right)^3=2^5.5^2+200\)
\(\Leftrightarrow\left(7.x-11\right)^3=800+200\)
\(\Leftrightarrow\left(7.x-11\right)^3=1000\)
\(\Leftrightarrow\left(7.x-11\right)^3=10^3\)
\(\Leftrightarrow7x-11=10\Leftrightarrow7x=21\Leftrightarrow x=3\)
c) \(3+2^{x-1}=24-\left[4^2-\left(2^2-1\right)\right]\)
\(\Leftrightarrow3+2^{x-1}=24-\left[4^2-3\right]\)
\(\Leftrightarrow3+2^{x-1}=24-13\)
\(\Leftrightarrow3+2^{x-1}=11\)
\(\Leftrightarrow2^{x-1}=8\Leftrightarrow2^{x-1}=2^3\Leftrightarrow x-1=3\Leftrightarrow x=4\)
a)\(3^x.3=243\Leftrightarrow3^x=81\Leftrightarrow3^x=3^4\Leftrightarrow x=4\)
b) \(2^x.16^2=1024\Leftrightarrow2^x.256=1024\Leftrightarrow2^x=4\Leftrightarrow2^x=2^2\Leftrightarrow x=2\)
c) \(64:4^x=16^8\Leftrightarrow4^x=67108864\Leftrightarrow4^x=4^{13}\Leftrightarrow x=13\)
d) \(2^x=16\Leftrightarrow2^x=2^4\Leftrightarrow x=4\)
243 : 3³ : 3 = 3⁵ : 3³ : 3
= 3⁵⁻³⁻¹
= 3
------------
4⁸ : 64 : 16 = 4⁸ : 4³ : 4²
= 4⁸⁻³⁻²
= 4³
= 64
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