\(\Rightarrow3^x\left(1+3^2\right)=810\\ \Rightarrow3^x=\dfrac{810}{10}=81=3^4\\ \Rightarrow x=4\)
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\(\Rightarrow3^x\left(1+3^2\right)=810\\ \Rightarrow3^x=\dfrac{810}{10}=81=3^4\\ \Rightarrow x=4\)
Tìm x , biết : (nâng cao)
C) 3x+4+ 3x+2= 810
D)3x+ 3x+2= 810
a)3x+1+3x+3=810
b)3x+3x+2=810
\(3^x+3^{x+2}=810\)
3 mũ x + 3 mũ x+ 2 bang 810
Tìm x :
3 mũ x +3 mũ x+2=810
1) \(3^x+3^{x+2}=810\)
2) \(\left(\dfrac{2}{3}x-1\right).\left(0,4x+5\right)=0\)
Tìm x biết
a) 27< 3\(^x\) < 243
b) 2\(^x\) + 2\(^{x+1}\) + 2\(^{x+1}\) + 2\(^{x+2}\) =56
c) 3\(^x\) + 3\(^{x+2}\) =810
3x+3x+2=810
3x+3x+2=810