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2x + 2x + 1 + 2x + 2 + 2x + 3 = 480
=> 2x.(1 + 2 + 4 + 8) = 480
=> 2x.15 = 480
=> 2x = 480 : 15
=> 2x = 32
=> 2x = 25
=> x = 5
có \(2^x+2^{x+1}+2^{x+2}+2^{x+3}=\)480
\(2^x\cdot1+2^x\cdot2+2^x\cdot4+2^x\cdot8=480\)
\(2^x\cdot\left(1+2+4+8\right)=480\)
\(2^x\cdot15=480\)
\(2^x=32\)
do đó x = 5
1) \(\left(x-2\right)^6=\left(x-2\right)^8\)
\(\Leftrightarrow\left(x-2\right)^8-\left(x-2\right)^6=0\)
\(\Leftrightarrow\left(x-2\right)^6.\left[\left(x-2\right)^2-1\right]=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\\left(x-2\right)^2=1\end{cases}}\) \(\Leftrightarrow\orbr{\begin{cases}x=2\\x=3,x=1\end{cases}}\)
2) \(2^x+2^{x+1}+2^{x+2}+2^{x+3}=480\)
\(\Leftrightarrow2^x.\left(1+2+2^2+2^3\right)=480\)
\(\Leftrightarrow2^x.15=480\)
\(\Leftrightarrow2^x=32=2^5\)
\(\Leftrightarrow x=5\)
\(2^x+2^{x+1}+2^{x+2}+2^{x+3}=480\)
\(2^x+2^x.2+2^x.4+2^x.8=480\)
\(2^x.\left(1+2+4+8\right)=480\)
\(2^x.15=480\)
\(2^x=32\)
\(2^x=2^5\)
\(x=5\)
Vậy \(x=5\)
2x+2x+1+2x+2+2x+3=480
<=>2x.(1+2+22+23)=480
<=>2x.15=480
<=>2x=32=25
<=>x=5
ta co1;2^x+2^x+1+2^x+2+2^x+3=480
=>2^x.1+2^x.2+2^x.2^2+2^x.2^3=480
=>2^x.(1+2+2^2+2^3)=480
=>2^x=480:15=32
=>2^x=2^5
=>x=5
2x+2x+1+2x+2+2x+3-480=0
2x+2x.2+2x.22+2x.23=0+480
2x.(1+2+22+23)=480
2x.(1+2+4+8)=480
2x.15=480
2x=480:15
2x=32=25
Vậy x =5
\(2^x+2^{x+1}+2^{x+2}+2^{x+3}-480=0\)
\(2^x+2^{x+1}+2^{x+2}+2^{x+3}=480\)
\(2^x.\left(1+2^1+2^2+2^3\right)=480\)
\(2^x.\left(1+2+4+8\right)=480\)
\(2^x.15=480\)
\(2^x=480:15\)
\(2^x=32\)
\(2^x=2^5\)
\(\Leftrightarrow x=5\)
Vậy x=5
Chúc bạn học tốt
2x +2x+1+2x+2+2x+3=480
2x+2x.21+2x.22+2x.23 = 480
2x(1+21+22+23) = 480
2x.15 = 480
2x = 480:15
2x = 32
2x = 25
=>x=5
\(2^x+2^{x+1}+2^{x+2}+2^{x+3}-480=0\)
\(\Rightarrow2^x+2^{x+1}+2^{x+2}+2^{x+3}=480\)
\(\Rightarrow2^x.1+2^x.2+2^x.2^2+2^x.2^3=480\)
\(\Rightarrow2^x\left(1+2+2^2+2^3\right)=480\)
\(\Rightarrow2^x.15=480\)
\(\Rightarrow2^x=480\div15\)
\(\Rightarrow2^x=32=2^5\)
Vậy x = 5
Ta có : \(2^x+2^{x+1}+2^{x+2}+2^{x+3}=480\)
\(\Leftrightarrow2^x\cdot\left(1+2^1+2^2+2^3\right)=480\)
\(\Leftrightarrow2^x\cdot15=480\)
\(\Leftrightarrow2^x=32=2^5\)
\(\Leftrightarrow x=5\)
Vậy : x=5
Cỏ giải nè:
2^x + 2^(x + 1) + 2^(x + 2) + 2^(x + 3) - 480 = 0
=>2^x + 2^(x + 1) + 2^(x + 2) + 2^(x + 3) = 480 + 0
=> 2^x + 2 * 2^x + 2² * 2^x + 2³ * 2^x = 480
=> 2^x * (1 + 2 + 4 + 8) = 2^x * 15 = 480
=> 2^x = 32
=> x = 5
Không chắc
<=> 2x + 2x.2 + 2x. 22+ 2x.23 = 480
<=> 2x.( 1 + 2+22+ 2 3) = 480
rồi tính trong ngoặc , lấy 480 chia cho cái kquả đó , rồi phân h kquả vừa chia ra lũy thừa của 2
\(2^x+2^x+1+2^x+2+2^x+3=480\)
\(8^x+6=480\)
\(8^x=474\)
\(\Rightarrow x\in\varnothing\)