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\(2\left(x-5\right)-17=25\)
\(2\left(x-5\right)=25+17\)
\(2\left(x-5\right)=42\)
\(x-5=42:2\)
\(x-5=21\)
\(x=21+5\)
\(x=26\)
Vậy x = 26
2(x - 5) - 17 = 25
2(x - 5) = 25 + 17
2(x - 5) = 42
x - 5 = 42 : 2
x - 5 = 21
x = 21
+ 5 = 26
`-2/5 : x=1/2`
`=> x= -2/5 : 1/2`
`=> x= -2/5 xx 2`
`=>x= -4/5`
__
`7/6 : x = 7/4`
`=>x= 7/6 : 7/4`
`=>x=7/6 xx 4/7`
`=>x= 28/42`
`=>x=2/3`
\(\dfrac{x-3}{13}+\dfrac{x-3}{14}=\dfrac{x-3}{15}+\dfrac{x-3}{16}\)
\(\Leftrightarrow x-3=0\)
hay x=3
\(\dfrac{2x-1}{3}=\dfrac{2-x}{-2}\)
\(\Rightarrow-2\left(2x-1\right)=3\left(2-x\right)\)
\(\Rightarrow-4x+2=6-3x\Rightarrow x=-4\)
3x-(-17)=14
3x=14+(-17)
3x=-3
x=(-3):3
x=-1
Vậy x=-1.
|x+9|.2=10
|x+9|=10:2
|x+9|=5
\(\Rightarrow\orbr{\begin{cases}x+9=-5\\x+9=5\end{cases}\Rightarrow\orbr{\begin{cases}x=-14\\x=-4\end{cases}}}\)
Vậy \(x\in\left\{-14;-4\right\}\)
\(3x-\left(-17\right)=14\)
\(3x+17=14\)
\(3x=14-17\)
\(3x=-3\)
\(x=-1\)
\(a,\left|x+9\right|.2=10\)
\(\left|x+9\right|=5\)
\(th1:x+9=5\)
\(x=-4\)
\(Th2:x+9=-5\)
\(x=-14\)
Vậy.....
hok tốt!!
2/3.x + 1/4 = 7/12
2/3.x = 7/12 - 1/4
2/3.x = 1/3
x = 1/3 : 2/3
x = 1/2
Bài làm
\(\frac{2}{3}x+\frac{1}{4}=\frac{7}{12}\)
\(\frac{2}{3}x=\frac{7}{12}-\frac{1}{4}\)
\(\frac{2}{3}x=\frac{7}{12}-\frac{3}{12}\)
\(\frac{2}{3}x=\frac{4}{12}\)
\(\frac{2}{3}x=\frac{1}{3}\)
\(x=\frac{1}{3}:\frac{2}{3}\)
\(x=\frac{1}{3}.\frac{3}{2}\)
\(x=\frac{1}{2}\)
Vậy \(x=\frac{1}{2}\)
14 : ( x - 17 ) = 2
(x-17) = 14 :2
x-17 = 7
x = 7+17
x = 24
14 : ( x - 17 ) = 2
x - 17 = 14 : 2
x - 17 = 7
x = 7 + 17
x = 24