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a. 2x +2x+3=144 b.3x + 3x+2 = 810
=>2x .1 +2x.23=144 =>3x.1 +3x.32=810
=>2x.(1+8)=144 =>3x.(1+9) =810
=>2x = 16 =>3x = 81
=>2x = 24 => 3x =34
=>x = 4 =>x = 4
vậy x=4 vậy x=4
2x+2x+3=144
=>2x+2x.23=144
=>2x+2x.8=144
=>2x.(8+1)=144
=>2x.9
=>2x=144:9
=>2x=16=24
=>x=4
2x+2x+3=144
2x . 1 + 2x . 23 = 144
2x . ( 1 + 23 ) = 144
2x . 9 = 144
2x = 144 : 9
2x = 16
2x = 24
=> x = 4
\(2^x+2^{x+3}=144\)
\(\Rightarrow2^x+2^x.2^3=144\)
\(\Rightarrow2^x.\left(1+2^3\right)=144\)
\(\Rightarrow2^x.9=144\)
\(\Rightarrow2^x=\frac{144}{9}=16=2^4\)
\(\Rightarrow x=4\)
k mình đi lê vnhx thuận!
2x+2x+3=144
2x+2x.23=144
2x(1+23)=144
2x.9=144
2x=144/9=16
2x=42
Vậyx=2
2x+23.2x=144
(2x.1)+(2x.23)=144
2x.(1+23)=144
2x. 9 =144
2x =144:9
2x =16
2x =24
\(\Rightarrow\)x =4
2^x+2^x+3=144
2^x+2^3.2^x=144
2^x.(2^3+1)=144
2^x.9=144
2^x=144:9
2^x=16
2^x=2^4
=>x=4
\(2^x+2^x\cdot2^3=144\)
\(2^x\cdot\left(1+8\right)=144\)
\(2^x=144:9\)
\(2^x=16=2^4\)
=> x = 4
\(2^x+2^{x+3}=144\)
\(\Leftrightarrow2^x+2^x.2^3=144\)
\(\Rightarrow2^x.\left(1+2^3\right)=144\)
\(\Rightarrow2^x=16\)
Mà \(2^4=16\)
\(\Rightarrow2^x=2^4\)
Vậy x = 4
2x+2x+3=144
=>2x+2x.23=144
=>2x(1+23)=144
=>2x.9=144
=>2x=16
=>x=4
\(2^x+2^{x+3}=144\)
\(2^x+2^x.2^3=144\)
\(2^x\left(1+8\right)=144\)
\(2^x.9=144\)
\(2^x=16\)
\(2^x=2^4\)
\(\Rightarrow x=4\)
2^x+2^x+3=144
=>2^x.1+2^x.2^3=144
=>2^x.(1+2^3)=144
=>2^x.(1+8)=144
=>2^x=144:9
2^x=16
=>2^x=2^4
vậy x=4