Question

[thuy chi]

tim x

x-2/x-1 = x+4/x+7

là phân số nhé

Answer 1

[Điệp viên 007]

\(\frac{x-2}{x-1}=\frac{x+4}{x+7}\)

\(\Leftrightarrow\left(x-2\right)\left(x+7\right)=\left(x-1\right)\left(x+4\right)\)

\(\Leftrightarrow x^2+7x-2x-14=x^2+4x-x-4\)

\(\Leftrightarrow x^2-x^2+7x-2x-4x+x=14-4\)

\(\Leftrightarrow2x=10\)

\(\Leftrightarrow x=5\)

hok tốt!