Câu a:

xem lại đề bài

Câu b:

5 2/8x - 1/9 = 4 3/5

42/8x - 1/9 = 23/5

21/4x = 23/5 + 1/9

21/4x = 207/45 + 5/45

21/4x = 212/45

x = 212/45: 21/4

x = 212/45 x 4/21

x = 848/945

Vậy: x = 848/945

Câu c:

45%x - 2/3x = 75%

9/20x - 2/3x = 3/4

x(9/20 - 2/3) = 3/4

x(27/60 - 40/60) = 3/4

x.(-13/60) = 3/4

x = 3/4 : (-13/60)

x = 3/4 x (-60/13)

x = - 45/13

Vậy x = - 45/13

a) <=> 10 - 2x + 5 = 1 - 3x

   <=>    -2x + 3x    = 1 - 10 - 5

   <=>      x             = -14

b) \(\Leftrightarrow\frac{x-1}{x+1}-\frac{8}{9}=0\)

    \(\Leftrightarrow\frac{9\left(x-1\right)-8\left(x+1\right)}{9\left(x+1\right)}=0\)

     \(\Leftrightarrow\frac{9x-9-8x-8}{9x+9}=0\)

     \(\Leftrightarrow\frac{x-17}{9x+9}=0\)

ĐK: 9x + 9 \(\ne\)0 => x \(\ne\)-1

     \(\Leftrightarrow x-17=0\)

     \(\Leftrightarrow x=17\)

Ps: Câu b không chắc lắm. 

phan b Vu Nhu Mai sai roi phai the nay moi dung

x-1/x+1=8/9

(x-1).9=(x+1).8

9x-9=8x+8

9x-8x=8+9

1x=17

x=17;1

x=17 

\(\left(x-3\right)\left(x-12\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-3=0\\x-12=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=3\\x=12\end{cases}}\)

\(\Rightarrow x\in\left\{3;12\right\}\)

\(\left(x^2-81\right)\left(x^2+9\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x^2-81=0\\x^2+9=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=9\\x\in\varnothing\end{cases}}\Leftrightarrow x=9\)

\(\Rightarrow x=9\)

\(\left(x-4\right)\left(x+2\right)< 0\)

\(\Rightarrow\hept{\begin{cases}x-4\\x+2\end{cases}}\)trái dấu

\(TH1:\hept{\begin{cases}x-4>0\\x+2< 0\end{cases}}\Leftrightarrow\hept{\begin{cases}x>4\\x< -2\end{cases}}\Leftrightarrow x\in\varnothing\)

\(TH2:\hept{\begin{cases}x-4< 0\\x+2>0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x< 4\\x>-2\end{cases}}\Leftrightarrow x\in\left\{-1;0;1;2;3\right\}\)

Vậy \(x\in\left\{-1;0;1;2;3\right\}\)

 Mình bó tay luôn,không giải nổi.