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2x + 2x + 1 + 2x + 2 = 960 - 2x + 3
Đê la tim stn x nha cc bn
MN giup mk vs
ai nhanh mk tick nha!!!!!!
A, (2x+1)3=343
=> (2x+1)3=73
=> 2x + 1 = 7
=> 2x = 6
=> x = 3
B, 2x+2x+3=144
=> 2x+2x . 23 =144
=> 2x ( 1 + 23 ) =144
=> 2x ( 1 + 8 ) =144
=> 2x . 9 =144
=> 2 x = 16
=> 2 x = 2 4
=> x = 4
C, 3x+3x+2=2430
=> 3x+3x . 32 =2430
=> 3x . ( 1 + 32 ) =2430
=> 3x . ( 1 + 9 ) =2430
=> 3x . 10 =2430
=> 3x = 243
=> 3x = 3 5
=> x = 5
2^5+12=32+12=44
3^6:3^2=3^(6-2)=3^4=81
3^2+3^(2+3)=9+3^5=9+243=252 nha
câu 3 x=2 mình viết nhầm
\(\Leftrightarrow2^x\cdot\dfrac{1}{8}+2^x\cdot\dfrac{1}{4}+2^x\cdot\dfrac{1}{2}=254\)
\(\Leftrightarrow2^x\cdot\dfrac{7}{8}=254\)
\(\Leftrightarrow2^x=\dfrac{2032}{7}\)
mà x là số tự nhiên
nên \(x\in\varnothing\)
\(2^{x+1}.3^y=12^x\)
\(\Rightarrow2^{x+1}.3^y=3^x.4^x\)
\(\Rightarrow2^{x+1}.3^y=3^x.2^{2x}\)
\(\Rightarrow\orbr{\begin{cases}2^{x+1}=2^{2x}\\3^y=3^x\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x+1=2x\\y=x\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=1\\\text{Vì y = x}\Rightarrow y=1\end{cases}}\)
\(\left\{x^2-\left[6^2-\left(8^2-9.7\right)^3-7.5\right]^3-5.3\right\}^3=1\)
\(\Rightarrow\left\{x^2-\left(36-1^3-35\right)^3-15\right\}^3=1\)
\(\Rightarrow x^2-\left(0^3-15\right)^3=1\)
\(\Rightarrow x^2-\left(-3375\right)=1\)
\(\Rightarrow x^2=-3374\)
\(\Rightarrow x\in\varnothing\)
{ x2 - [ 62 - ( 82 - 9.7)3 - 7.5]3 - 5.3 }3 = 1
{ x2 + [ 36 - (64 - 63)3 - 35]3 - 15}3 = 1
[ x2 - ( 36 - 13 - 35 ) - 15 ]3 = 1
[ x2 - ( 36 - 1 - 35 ) - 15]3 = 1
[ x2 - ( 35 - 35 ) - 15]3 = 1
[ x2 - 0 - 15]3 = 1
( x2 - 15 )3 = 1
<=> ( x2 - 15)3 = 13
=> x2 - 15 = 1
<=> x2 = 16
=> x = 4
\(\frac{2^X}{2^3}+\frac{2^X}{2^2}+\frac{2^X}{2^1}=254\)
\(2^X+2.2^X+4.2^X=2^3.254\)
\(7.2^X=2032\)
\(2^X=\frac{2032}{7}\)(\(X\ne2^{\alpha}\))
\(\Rightarrow DESAI\)
2x + 2x+ 1 + 2x + 2 + 2x + 3 = 120
2x . 1 + 2x . 21 + 2x . 22 . 2x . 23 = 120
2x . 1 + 2x . 2 + 2x . 4. 2x . 8= 120
2x . ( 1 + 2 + 4 + 8 ) = 120
2x . 15 = 120
2x = 120 : 15
2x = 8
2x = 23
\(\Rightarrow\)x = 3
Vậy x = 3
Nhớ k cho mk nha ^_^
\(2^x+2^x.2+2^x.2^2+2^x.2^3=120\)
\(2^x\left(1+2+2^2+2^3\right)=120\)
\(2^x.15=120\)
\(2^x=8\)
\(2^x=2^3\)
\(x=3\)
hok tốt!!