tìm x, biết4 mu x + 4 mux+3 = 4160
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\(\dfrac{4-x}{-5}=\dfrac{-5}{4-x}\)
\(\Leftrightarrow\left(4-x\right)\left(4-x\right)=-5\times-5\)
\(\Rightarrow\left(4-x\right)^2=25\)
\(\Rightarrow\left[{}\begin{matrix}4-x=5\\4-x=-5\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=-1\\x=9\end{matrix}\right.\)
\(\dfrac{4-x}{-5}=\dfrac{-5}{4-x}\)
\(\Rightarrow\left(4-x\right).\left(4-x\right)=\left(-5\right).\left(-5\right)\)
\(\Rightarrow\left(4-x\right)^2=25\)
\(\Rightarrow\left(4-x\right)^2=5^2\)
\(\Rightarrow4-x=\pm5\)
\(\Rightarrow\left[{}\begin{matrix}4-x=5\\4-x=-5\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=4-5\\x=4-\left(-5\right)\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=-1\\x=9\end{matrix}\right.\)
4x+4x+3=4160
=>4x+4x.43=4160
=>4x(1+64)=4160
=>65.4x=4160
=>4x=64
=>x=3
Vậy x=3
\(4^x+4^{x+3}=4160\)
\(\Rightarrow4^x+4^x.4^3=4160\)
\(\Rightarrow4^x.\left(1+4^3\right)=4160\)
\(\Rightarrow4^x.65=4160\)
\(\Rightarrow4^x=64\)
\(\Rightarrow x=3\)
\(4^x+4^{x+3}=4160\)
\(4^x\times\left(1+4^3\right)=4160\)
\(4^x\times\left(1+64\right)=4160\)
\(4^x\times65=4160\)
\(4^x=\frac{4160}{65}\)
\(4^x=64\)
\(4^x=4^3\)
\(x=3\)
\(4^x+4^{x+3}=4160\)
\(\Rightarrow4^x+4^x.4^3=4160\)
\(\Rightarrow4^x.\left(1+4^3\right)=4160\)
\(\Rightarrow4^x.65=4160\)
\(\Rightarrow4^x=64\)
\(\Rightarrow4^x=4^3\)
\(\Rightarrow x=3\)
Vậy \(x=3\)
\(4^{x+3}+4^x=4160\)
\(\Rightarrow4^x.4^3+4^x=4160\)
\(\Rightarrow4^x.\left(4^3+1\right)=4160\)
\(\Rightarrow4^x.65=4160\)
\(\Rightarrow4^x=4160:65\)
\(\Rightarrow4^x=64\)
\(\Rightarrow4^x=4^3\)
\(\Rightarrow x=3\)
\(4^{x+3}+4^x=4160\)
\(\left(4^x\cdot4^3\right)+4^x=4160\)
\(4^x\cdot\left(4^3+1\right)=4160\)
\(4^x\cdot\left(64+1\right)=4160\)
\(4^x\cdot65=4160\)
\(4^x=4160:65\)
\(4^x=64\)
\(\Rightarrow4^x=4^3\)
\(\Rightarrow x=3\)
Thưa toàn thể quý vị, chào mừng các bạn đến đây
Ta có: 4\(^x\)+4\(^{x+3}\)=4160
\(\Rightarrow\)4\(^x\).(1+4\(^3\))=4160
\(\Rightarrow\)4\(^x\).65=4160
\(\Rightarrow\)4\(^x\)=64
\(\Rightarrow\)4\(^x\)=4\(^3\)\(\Rightarrow\)x=3
4x+4x+3=4160
\(\Rightarrow\)4x+4x.43=4160
\(\Rightarrow\)4x.(1+43)=4160
\(\Rightarrow\)4x.65=4160
\(\Rightarrow\)4x=4160:65
\(\Rightarrow\)4x=64
\(\Rightarrow\)4x=43
\(\Rightarrow\)x=3
\(4^x+4^{x+3}=4160\)
\(\Leftrightarrow4^x.\left(1+4^3\right)=4160\)
\(\Leftrightarrow4^x.65=4160\)
\(\Leftrightarrow4^x=4160:65=64\)
\(\Rightarrow x=3\)