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\(2^{x+3}+2^x=144\)
\(\Rightarrow2^x.2^3+2^x=144\)
\(\Rightarrow2^x\left(2^3+1\right)=144\)
\(\Rightarrow2^x.9=144\)
\(\Rightarrow2^x=16\)
\(\Rightarrow2^x=2^4\)
\(\Rightarrow x=4\)
Vậy x = 4
2x+3+2x=144
=> 2x.(23+1)=144
=> 2x.(8+1)=144
=> 2x.9=144
=> 2x =144:9
=> 2x =16
=> 2x=24
=> x=4
Học vui!^^
Ta có:\(2^{x+3}+2^x=144\)
\(\Rightarrow2^x\left(2^3+1\right)=144\)
\(\Rightarrow2^x.9=144\)
\(\Rightarrow2^x=16\Rightarrow2^x=2^4\)
\(\Rightarrow x=4\)
\(2^x+2^{x+3}=144\)
\(\Leftrightarrow2^x\left(1+2^3\right)=144\)
\(\Leftrightarrow2^x=16\)
\(\Leftrightarrow x=4\)
\(2^x+2^{x+3}=144\)
\(\Rightarrow2^x+2^x.2^3=144\)
\(\Rightarrow2^x.\left(1+2^3\right)=144\)
\(\Rightarrow2^x.9=144\)
\(\Rightarrow2^x=16\)
\(\Rightarrow2^x=2^4\)
\(\Rightarrow x=4\)
Vậy \(x=4\)
a) Mik làm được mỗi phần a thôi nha ! Thông cảm !
a) 38 - 2x = 3 . 23
38 - 2x = 3 . 8
38 - 2x = 24
2x = 38 - 24
2x = 14
=> x = 7
Vậy x = 7
a) 38 - 2x = 3.23
38 - 2x = 3.8
38 - 2x = 24
2x = 38 - 24
2x = 14
x = 7
b) 2x + 3 + 2x = 144
9.2x = 144
2x = 144 : 9
2x = 16
2x = 24
x = 4
\(2^{x+3}+2^x=144\)
\(2^x.2^3+2^x=144\)
\(2^x.\left(2^3+1\right)=144\)
\(2^x.9=144\)
\(2^x=16\)
\(2^x=2^4\)
\(x=4\)
\(2^{x+3}+2^x=144\)
\(\Leftrightarrow2^x.2^3+2^x.1=144\)
\(\Leftrightarrow2^x.8+2^x.1=144\)
\(\Leftrightarrow2^x.\left(8+1\right)=144\)
\(\Leftrightarrow2^x.9=144\)
\(\Leftrightarrow2^x=144:9\)
\(\Leftrightarrow2^x=16\)
\(\Leftrightarrow2^x=2^4\)
\(\Rightarrow x=4\)
Vậy \(x=4\)
câu a : x = Hình như đề sai
Câu b : x=4
câu c : x = 5
\(a)2^{x+3}+2^x=144\)
\(2^x.3+2^x.1=144\)
\(2^x.\left(3+1\right)=144\)
\(2^x.4=144\)
\(2^x=144:4\)
\(2^x=36\)
\(\Rightarrow x\in\varnothing\)
phần b chịu
a, 2x+3 + 2x = 144
2x . 23 + 2x . 1 = 144
2x . ( 23 + 1 ) = 144
2x . 9 = 144
2x = 144 : 9
2x = 16
2x = 24
x = 4
2x + 2x+3 = 144
\(\Rightarrow\)2x + 2x . 8 = 144
\(\Rightarrow\)2x . ( 8 + 1 ) = 144
\(\Rightarrow\)2x . 9 = 144
\(\Rightarrow\)2x = 16
\(\Rightarrow\)2x = 24
\(\Rightarrow\)x = 4
( 4x - 1 ) 2 = 25 . 9
\(\Rightarrow\)(4x - 1 )2 = 52 . 32
\(\Rightarrow\)(4x - 1 ) 2 = 152
\(\Rightarrow\)4x - 1 = 15
\(\Rightarrow\)4x = 16
\(\Rightarrow\)x = 4
2x + 2x+3 = 144
2x.(1+23) = 144
=> 2x.9 = 144
=> 2x = 16 = 24
=> x = 4