Question

Tìm x, biết \(\dfrac{7}{x-5}\) = \(\dfrac{56}{32}\)

(trình bày đày đủ)

Answer 1

\(\Leftrightarrow\dfrac{7}{x-5}=\dfrac{7}{4}\)

\(\Leftrightarrow x-5=4\Leftrightarrow x=9\)

Answer 2

ĐKXĐ:\(x\ne5\)

\(\dfrac{7}{x-5}=\dfrac{56}{32}\\ \Rightarrow\dfrac{7}{x-5}=\dfrac{7}{4}\\ \Rightarrow x-5=4\\ \Rightarrow x=5+4\\ \Rightarrow x=9\left(tm\right)\)

Answer 3

9