Bài 2: 

a: =a-b+c+a-c+b-b

=2a-b

b: =2x-5+x-a+x-5-a

=4x-10-2a

a) 2x + 1 = 3

2x = 2

x = 1

b) ( 2x - 5 ) + 17 = 6

( 2x - 5 ) = 6 - 17

( 2x - 5 ) = -11

2x = -11 + 5

2x = -6

x = -3

c) 10 - 2 x ( 4 - 3x ) = -4

2 x ( 4 - 3x ) = 14

4 - 3x = 7

3x = -3 

x = -1 

a) 2x + 1 = 3

2x = 3-1

2x=2

x=2:2

x=1

a) \(2^x.4=128\Rightarrow2^x=32=2^5\Rightarrow x=5\)

b) \(x^{17}=x\Rightarrow x^{17}-x=0\Rightarrow x\left(x^{16}-1\right)=0\Rightarrow x=0\) hay \(x=1\)

c) \(\left(2x-2\right)^3=8\Rightarrow\left(2x-2\right)^3=2^3\Rightarrow2x-2=2\Rightarrow2x=4\Rightarrow x=2\)

d) \(\left(x-6\right)^3=\left(x-6\right)^2\Rightarrow\left(x-6\right)^3-\left(x-6\right)^2=0\)

\(\Rightarrow\left(x-6\right)^2\left(x-6-1\right)=0\Rightarrow\Rightarrow\left(x-6\right)^2\left(x-7\right)=0\)

\(\Rightarrow x-6=0\) hay \(x-7=0\Rightarrow x=6\) hay \(x=7\)

e) \(\left(7x-11\right)^3=2^5.5^2+200\Rightarrow\left(7x-11\right)^3=32.25+200\)

\(\Rightarrow\left(7x-11\right)^3=1000=10^3\Rightarrow7x-11=10\Rightarrow7x=21\Rightarrow x=3\)

f) \(3+2^{x-1}=24-\left[4^2-\left(2^2-1\right)\right]\Rightarrow2^{x-1}=24-\left[16-3\right]-3\)

\(\Rightarrow2^{x-1}=24-13-3\Rightarrow2^{x-1}=8=2^3\Rightarrow2x-1=3\Rightarrow2x=4\Rightarrow x=2\)

Cảm ơn bạn Nguyễn Đức Trí rất nhìu nha!

a) \(\left|x\right|-\frac{3}{4}=\frac{5}{3}\)

\(\left|x\right|=\frac{5}{3}+\frac{3}{4}\)

\(\left|x\right|=\frac{29}{12}\)

\(\orbr{\begin{cases}x=\frac{29}{12}\\x=-\frac{29}{12}\end{cases}}\)

          172 - (2x   8)=2          

Ai giải hộ mink ik

a) 13-[7-(x+8)]=11         

    [7-(x+8)]=13-11

    [7-(x+8)]=2

    (x+8)=7-2

    (x+8)=5

     x=5-8

     x=-3

d) khó nhất mk làm nhé : 
\(\left|2x-1\right|=\left(-4\right)^2\)

\(\left|2x-1\right|=16\)

\(\Leftrightarrow\orbr{\begin{cases}2x-1=16\\2x-1=-16\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}2x=17\\2x=-15\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=\frac{17}{2}\\x=-\frac{15}{2}\end{cases}}\)

Giúp mình vs.

\(\left|x-1\right|=2x-1\)

\(\Rightarrow\orbr{\begin{cases}x-1=2x-1\\x-1=-2x+1\end{cases}\left(đk:2x\ge\frac{1}{2}\right)}\)

\(\Rightarrow\orbr{\begin{cases}x=0\left(ktm\right)\\x=\frac{2}{3}\left(tm\right)\end{cases}}\)

vậy \(x=\frac{2}{3}\)

a)

 13/4+x=2

          x=2-13/4

         x=-5/4

b)

 2x.17/12=3/7

 2x          =3/7;17/12

 2x         =36/119

  x           =36/119 : 2

  x           =18/119

c)

 2x.17/12=19/7

 2x         =19/7:17/12

 2x         =228/119

   x         =228/119;2

   x         =114/119

d)

 1/2x + 5/6=-3

 1/2x         =-3-5/6

 1/2x         =-23/6

     x          =-23/6:1/2

    x          =-23/3