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3^{x}.3^{x+1}.3^{x+2}>=729`
`=>3^{x+x+1+x+2}>=3^6`
`=>3^{3x+3}>=3^6`
`=>3x+3>=6`
`=>3x>=3=>x>=1`
\(\left(x-1\right).3=15\\ =>x-1=5\\ =>x=6\)
\(20:\left(x+1\right)-3=2\\ =>20:\left(x+1\right)=5\\ =>x+1=4\\ =>x=3\)
\(\left(x-1\right).3=15\)
\(x-1=15:3\)
\(x-1=5\)
\(x=5+1\)
\(x=6\)
Vậy \(x=6\)
\(20:\left(x+1\right)-3=2\)
\(\left(x+1\right)-3=20:2\)
\(\left(x+1\right)-3=10\)
\(x+1=10-3\)
\(x+1=7\)
\(x=7-1\)
\(x=6\)
Vậy \(x=6\)
\(3^2.3^x.81-27^4=0\)
\(3^2.3^x.3^4-\left(3^3\right)^4=0\)
\(3^6.3^x-3^{12}=0\)
\(3^6.3^x-3^{12}=0\)
\(3^6.3^x=0+3^{12}\)
\(3^6.3^x=3^{12}\)
\(3^{6+x}=3^{12}\)
\(\Rightarrow6+x=12\)
\(x=12-6\)
\(\Rightarrow x=6\)
\(a,\Rightarrow x=3\)
\(b,\Rightarrow2x-1=2\)
\(\Rightarrow2x=3\)
\(\Rightarrow x=\dfrac{3}{2}\)
\(c,\Rightarrow x-2=4\)
\(\Rightarrow x=6\)
\(d,\Rightarrow2x-3=3\)
\(\Rightarrow2x=6\)
\(\Rightarrow x=3\)
` x . 3 + x : 3=2`
`=> x . 3 + x . 1/3 =2`
`=> x . (3+1/3)=2`
`=> x . (9/3 +1/3)=2`
`=> x . 10/3=2`
`=> x=2:10/3`
`=> x= 2 . 3/10`
`=> x= 6/10= 3/5`