\(2^x+2^{x+1}+2^{x+2}+2^{x+3}-480=0\)
=> \(2^x+2^{x+1}+2^{x+2}+2^{x+3}=480\)
=>\(2^x+2^x.2+2^x.2^2+2^x.2^3=480\)
=> \(2^x.\left(1+1.2+1.2^2+1.2^3\right)=480\)
=>\(2^x.15=480\)
=> \(2^x=32\)
=>\(2^x=2^5\)
=>\(x=5\)
Vậy x=5
hà chí dương nói đúng đó! đây đâu phải toán 5
2x+2x+1+2x+2+2x+3-480=0
=>2x+2xx2+2xx22+2xx23=480
=>2xx(1+2+22+23)=480
=>2xx(1+2+4+8)=480
=>2xx15=480
=>2x=480:15
=>2x=32
=>2x=25
=>x=5
\(2^x\left(1+2^1+2^2+2^3\right)=480\)
\(2^x\times15=480\)
\(2^x=480:15\)
\(2^x=32\)
\(\Rightarrow2^x=2^5\)
\(\Rightarrow x=5\)