$\frac{x-1}{4}$ $=$ $\frac{9}{x-1}$ Tìm $x$ 25/10/2021 Bởi Audrey $\frac{x-1}{4}$ $=$ $\frac{9}{x-1}$ Tìm $x$
x-1/4=9/x-1 =>(x-1)^2=4.9 =>(x-1)^2=36 =>(x-1)^2=6^2 hoặc (x-1)^2=(-6)^2 =>x-1=6 hoặc x-1=-6 =>x=7 hoặc x=-5 Bình luận
`(x-1)/4=9/(x-1)` ⇒`(x-1)(x-1)=4.9` ⇔`(x-1)^2=36` ⇔\(\left[ \begin{array}{l}x-1=6\\x-1=-6\end{array} \right.\) ⇔\(\left[ \begin{array}{l}x=7\\x=-5\end{array} \right.\) Bình luận
x-1/4=9/x-1
=>(x-1)^2=4.9
=>(x-1)^2=36
=>(x-1)^2=6^2
hoặc (x-1)^2=(-6)^2
=>x-1=6 hoặc x-1=-6
=>x=7 hoặc x=-5
`(x-1)/4=9/(x-1)`
⇒`(x-1)(x-1)=4.9`
⇔`(x-1)^2=36`
⇔\(\left[ \begin{array}{l}x-1=6\\x-1=-6\end{array} \right.\)
⇔\(\left[ \begin{array}{l}x=7\\x=-5\end{array} \right.\)