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3x+3*32x-1*3x=729
\(\Rightarrow3^{x+3+2x-1+x}=3^6\)
\(\Rightarrow3^{4x+2}=3^6\)
\(\Rightarrow4x+2=6\)
\(\Rightarrow4x=4\)
\(\Rightarrow x=1\)
\(3^{2x}=\left(3^2\right)^x\)\(\Rightarrow9^x=729\)\(\Rightarrow x=3\)
\(3^{2x}\) = 729
<=>\(9^x\) = 729
<=>9 . 9 .9 = 729
<=> \(9^3\) = 729
<=> x =3
Vay :x=3
câu a
2 mũ x = 512 chia 8
2 mũ x =64
2 mũ x = 2 mũ 6
suy ra x =6
3^ x . 3^ 2= 729
3^ x . 9 = 729
3^ x = 729: 9
3^x =81
vậy x = 3^3
5^ x . 625 = 3125
5^x = 3125:625
5^x = 5
vậy x = 1
( 2x+1 )^ 3 = 27
( 2x+1) ^ 3 = 3^3
vậy 2x+1 = 3
vậy x = 0
\(3^{x+3}.3^{2x-1}.3^x=729\)
\(3^{x+3+2x-1+x}=729\)
\(3^{4x+2}=3^6\)
\(\Rightarrow4x+2=6\)
\(\Rightarrow4x=4\)
\(\Rightarrow x=1\)
\(9^{2x-1}=729=9^3\Leftrightarrow2x-1=3\Leftrightarrow2x=4\Leftrightarrow x=2\)
Trả lời :............................................
\(9^{2x-1}=729=9^3\Leftrightarrow2x-1=3\Leftrightarrow2x=4\Leftrightarrow x=2\)
Hk tốt,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
k nhé Kiet nguyen
\(\left(2x+1\right)^3=729\)
\(\Leftrightarrow\)\(\left(2x+1\right)^3=9^3\)
\(\Leftrightarrow\)\(2x+1=9\)
\(\Leftrightarrow\)\(2x=8\)
\(\Leftrightarrow\)\(x=4\)
Vậy...
\(\left(2x+1\right)^3=729\)
\(\Rightarrow2x+1=9\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=4\)
(2x + 1)3 = 729
(2x + 1)3 = 93
2x + 1 = 9
2x = 9 - 1
x = 8 : 2
x = 4
( 2x + 1 )3 = 729
<=> ( 2x + 1 )3 = 93
<=> 2x + 1 = 9
<=> 2x = 9 -1
<=> 2x = 8
<=> x = 8 : 2
<=> x = 4
\(\left(2x+1\right)^3=729\)
\(\Rightarrow\left(2x+1\right)^3=9^3\)
\(\Rightarrow2x+1=9\)
\(\Rightarrow2x=9-1\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=8:2\)
\(\Rightarrow x=4\)
Vậy x = 4
_Chúc bạn học tốt_