Question

x-1/x+1=8/9

Giải giúp mk nha ai nhanh mk tick 

Answer 1

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

\(\Rightarrow\left(x-1\right)\cdot9=\left(x+1\right)\cdot8\)

\(\Rightarrow9x-9=8x+8\)

\(\Rightarrow9x-8x=8+9\)

\(\Rightarrow1x=17\)

\(\Rightarrow x=17\)

Answer 2

\(\frac{x-1}{x+1}=\frac{8}{9}\)<=> 9(x-1) = 8(x+1) <=> 9x-9 = 8x+8 <=> 9x-8x = 8 + 9 <=> x = 17