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824 - 824 : 824 = 823x
824 - 1 = 823x
823 = 823 x
x = 823 : 823
x = 1
( x - 1 ) + 2x - 2 + 3x - 3 = 0
( x - 1 ) + 2x - 2 + 3x = 0 + 3
( x - 1 ) + 2x - 2 + 3x = 3
( x - 1 ) + 2x - 2 + x = 3 : 3
( x - 1 ) + 2x - 2 + x = 1
Làm tiếp nhé
824 - 824 : 824 = 823x
824 - 1 = 823 x
823 x = 823
x = 1
Vậy x = 1
a) 2/3 + 1/3(2x-1) =-5
1/3(2x-1) = -5 - 2/3
1/3(2x-1) = -17/3
2x-1 = -17/3 : 1/3
2x-1 = -17
2x = -17 + 1
2x = -16
x = -16 : 2
x = -8
b) 25% .x + 2x = 4
x .( 25%+2 ) = 4
x . 9/4 = 4
x = 4 : 9/4
x = 16/9
128 - 3.95 - 2\(x\) = 107
128 - 285 - 2\(x\) =107
-157 - 2\(x\) = 107
2\(x\) = -107 - 157
2\(x\) = -264
\(x\) = -264 : 2
\(x\) = -132
b, (3\(x\) - 25) - (\(x\) - 9) = 2 - \(x\)
3\(x\) - 25 - \(x\) + 9 = 2 - \(x\)
3\(x\) - \(x\) + \(x\) = 2 + 25 - 9
3\(x\) = 18
\(x\) = 18 : 3
\(x\) = 6
5x - 2x = 25 + 19
x ( 5 - 2 ) = 44
x . 3 = 44
x = 44 : 3
x = \(\frac{44}{3}\)
Vậy x = \(\frac{44}{3}\)
( don't k # EXOComingsoon )
a]={23;24;25;26....;35}
b]={4;8;14;...}
c]{4}
Tim x thuoc N=thi ko biet nha!
a) \(\left(2x+3\right)^2=\frac{9}{25}\)
\(\Rightarrow\left(2x+3\right)^2=\left(\frac{3}{5}\right)^2\) hoặc \(\left(2x+3\right)^2=\left(-\frac{3}{5}\right)^2\)
\(\Rightarrow2x+3=\frac{3}{5}\) hoặc \(2x+3=-\frac{3}{5}\)
\(\Rightarrow2x=-\frac{12}{5}\) hoặc \(2x=-\frac{18}{5}\)
\(\Rightarrow x=-\frac{6}{5}\) hoặc \(x=-\frac{9}{5}\)
Vậy.......
b) \(\left(3x-1\right)^3=\frac{1}{27}\)
\(\left(3x-1\right)^3=\left(\frac{1}{3}\right)^3\)
\(\Rightarrow3x-1=\frac{1}{3}\)
\(\Rightarrow3x=\frac{4}{3}\)
\(\Rightarrow x=\frac{4}{9}\)
Vậy.......
a) (2x+3)2=\(\frac{9}{25}\)
2x+3=\(\sqrt{\frac{9}{25}}\)=\(\frac{3}{5}\)
2x=\(\frac{-12}{5}\)
x=\(\frac{-6}{5}\)
b) (3x-1)3=\(\frac{-1}{27}\)
3x-1=\(\frac{-1}{3}\)
3x=\(\frac{2}{3}\)
x=\(\frac{2}{9}\)
a) \(5^4:\left(2x-1\right)^2=25\\ \Leftrightarrow5^4:\left(2x-1\right)^2=5^2\\ \Leftrightarrow5^4:5^2=\left(2x-1\right)^2\\ \Leftrightarrow\left[{}\begin{matrix}\left(2x-1\right)^2=5^2\\\left(2x-1\right)^2=\left(-5\right)^2\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}2x-1=5\\2x-1=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-2\end{matrix}\right.\)
b) \(17^3.x=17^4\\ \Rightarrow x=17^4:17^3=17\)
c) \(\left(2x+1\right)^3:49=7\\ \Leftrightarrow\left(2x-1\right)^3:7^2=7\\ \Leftrightarrow\left(2x-1\right)^3=7.7^2=7^3\\ \Leftrightarrow2x-1=7\\ \Leftrightarrow x=4\)
a)54 : (2x - 1)2 =25
54 : (2x - 1)2 =52
(2x - 1)2 =54 : 52
(2x - 1)2 = 52
2x - 1 = 5
2x = 5+1
2x = 6
x = 6: 2
x = 3
b)173.x = 174
x = 174 : 173
x = 17
c)(2x + 1)3 : 49 =7
(2x + 1)3 = 7 . 49
(2x + 1)3 = 343
(2x + 1)3 = 73
2x +1 = 7
2x = 7- 1
2x = 6
x = 6:2
x = 3