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\(\frac{1}{2}.x\)+\(\frac{3}{5}\).( x - 2 ) = 3
1/2 . x + 3/5 . x - 3/5 . 2 = 3
x . ( 1/2 + 3/5 ) - 6/5 = 3
x . 11/10 - 6/5 = 3
x . 11/10 = 3 + 6/5
x . 11/10. = 21/5
x. = 21/5 : 11/10
x. = 42/11
Vậy x = 42/11
a, \(\frac{x}{5}-\frac{2}{3}+2x=\frac{1}{2}\)
\(\frac{6x}{30}-\frac{20}{30}+\frac{60x}{30}=\frac{15}{30}\)
\(\frac{66x-20}{30}=\frac{15}{30}\)
\(\Rightarrow\) 66x - 20 = 15
66x = 15 + 20
66x = 35
x = \(\frac{35}{66}\)
Vậy x = \(\frac{35}{66}\)
b, \(\frac{5}{2}-3\left(\frac{1}{3}-x\right)=\frac{1}{7}\)
\(\frac{5}{2}-1+3x=\frac{1}{7}\)
\(\frac{3}{2}+3x=\frac{1}{7}\)
3x = \(\frac{1}{7}-\frac{3}{2}\)
3x = \(\frac{-19}{14}\)
x = \(\frac{-19}{42}\)
Vậy x = \(\frac{-19}{42}\)
Phần c lỗi, chắc như thế này
c, \(4\cdot\left(\frac{1}{2}-x\right)+\frac{1}{2}=\frac{-5}{6}+x\)
\(2-4x+\frac{1}{2}=\frac{-5}{6}+x\)
\(\frac{5}{2}-4x=\frac{-5}{6}+x\)
\(-4x-x=\frac{-5}{6}-\frac{5}{2}\)
\(-5x=\frac{-10}{3}\)
x = \(\frac{2}{3}\)
Vậy x = \(\frac{2}{3}\)
Chúc bn học tốt
\(3\left(x-5\right)-2\left(x+4\right)=-1\)
\(\Rightarrow3x-15-2x-8=-1\)
\(\Rightarrow3x-2x=-1+8+15\)
\(\Rightarrow x=22\)
\(\left|x-3\right|-5^2=\left(-5\right).4\)
\(\Rightarrow\left|x-3\right|=5\)
\(\Rightarrow\orbr{\begin{cases}x-3=5\\x-3=-5\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=8\\x=-2\end{cases}}\)
\(-14-2\left|x-5\right|=0\)
\(\Rightarrow2\left|x-5\right|=-14\)
Vì \(\left|x\right|\ge0\Rightarrow2\left|x-5\right|=-14\)(vô lí)
\(\left(3x+1\right)^2=49\)
\(\Rightarrow\left(3x+1\right)^2=\left(\pm7\right)^2\)
\(\Rightarrow\orbr{\begin{cases}3x+1=7\\3x+1=-7\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=2\\x=-\frac{8}{3}\end{cases}}\)
\(2\left(x-3\right)-5\left(x-4\right)=-7+14.\left(-3\right)\)
\(2x-6-5x+20=-7+\left(-42\right)\)
\(\left(2x-5x\right)+\left(-6+20\right)=-49\)
\(-3x+14=-49\)
\(-3x=-63\)
\(x=21\)
32.x+42.x=52
=>(32+42).x=25
=>(9+16).x=25
=.25.x=25
=>x=25:25
=>x=1
Vậy x=1
3-2(x+2)=5-x
\(\Rightarrow3-2x-4=5-x\)
\(\Rightarrow-2x+x=5+4-3\)
\(\Rightarrow-x=6\)
\(\Rightarrow x=-6\)
3 - 2 . ( x + 2 ) = 5 - x
=> 3 - 2x - 4 = 5 - x
=> -1 - 2x = 5 - x
=> -1 - 5 = - x + 2x
=> x = -6
Vậy x = -6