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-x + 5 + 2x = 4 - x
-1x + 5 + 2x = 4 - x
x( - 1 + 2 ) + 5 = 4 - x
x + 5 = 4 - x
=> x + 5 - 4 + x = 0
2x + ( 5 - 4 ) = 0
2x + 1 = 0
2x = 1
x = 1/2
3/2.(x-5/3)+4/5=x+1
3/2.x-3/2.5/3+4/5=x+1
3/2.x-5/2-x=1+4/5
3/2.x-5/2-x=9/5
3/2.x-x=9/5+5/2
1/2.x=43/10
x=43/10:1/2
x=43/5
A. x = 2
B. \(\dfrac{3}{8}=\dfrac{6}{x}\)\(\Leftrightarrow x=\dfrac{6.8}{3}=16\)
C. x = 3
D. \(x=\dfrac{4.6}{8}=3\)
E. \(x=\dfrac{7}{3}\)
G.\(\dfrac{14}{13}=\dfrac{28}{10-x}\)
<=>\(14\left(10-x\right)=364\)
<=> 10 - x = 26
<=> x = -16
H. \(3\left(x+2\right)=4\left(x-5\right)\)
<=> 3x + 6 = 4x - 20
<=> -x = -26
<=> x = 26
K. \(\dfrac{x}{2}=\dfrac{8}{x}\)
<=> \(x^2=16\)
<=> \(\left[{}\begin{matrix}x=4\\x=-4\end{matrix}\right.\)
M. \(\left(x-2\right)^2=100\)
<=> \(\left[{}\begin{matrix}x-2=10\\x-2=-10\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=12\\x=-8\end{matrix}\right.\)
a=2
b=16
c=3
d=3
mik chỉ biết thế này thôi(ko chắc đúng=3)
\(2x-3-3x+3.5=4.3-4.x-18\)
<=> \(2x-3-3x+15=12-4x-18\)
<=> \(2x-3x+4x=12-18-15+3\)
<=>\(3x=-18\)
<=> x=-18/3=-6
\(2x-3-3\left(x-5\right)=4\left(3-x\right)-18\)
\(\Leftrightarrow2x-3-3x+15=12-4x-18\)
\(\Leftrightarrow\left(2x-3x\right)+\left(15-3\right)=\left(12-18\right)-4x\)
\(\Leftrightarrow-x+12=-6-4x\)
\(\Leftrightarrow12=-6-3x\)
\(\Leftrightarrow3x=-6-12\)
\(\Leftrightarrow3x=-18\)
\(\Leftrightarrow x=\frac{-18}{3}\)
\(\Leftrightarrow x=-6\)
\(\text{Vậy }x=-6\)
\(a)\frac{7}{3}-\frac{4}{3}\times x=\frac{5}{6}\)
\(-\frac{4}{3}\times x=\frac{3}{2}\)
\(x=\frac{-9}{8}\)
\(b)\frac{7}{4}-\frac{3}{4}\times x=\frac{5}{6}\)
\(-\frac{3}{4}\times x=\frac{11}{12}\)
\(x=-\frac{11}{9}\)
=> 5 - [ 4 - ( 1 + 2x ) ] = -6
=> 4 - 1 - 2x = 11
=> 2x = 3 - 11 = -8
=> x = -4
\(\dfrac{3}{x}-5=-\dfrac{4}{x}+2\)
\(\dfrac{3}{x}-\left(-\dfrac{4}{x}\right)=2+5\)
\(\dfrac{3}{x}+\dfrac{4}{x}=7\)
\(\dfrac{1}{x}.\left(3+4\right)=7\)
\(\dfrac{1}{x}.7=7\)
\(\dfrac{1}{x}=7:7=1\)
\(\Rightarrow x=1\)
`3/x -5 = -4/x +2(đk : x ne 0)`
`3/x +4/x = 2+5`
`7/x = 7`
`x =7/7=1(t//m)`
Vậy `x=1`