Question

a)5x(x - 4) - 5x² = 2(11 - x)

b)\(\frac{3}{x-3}-\frac{2}{x+3}=\frac{4x}{x^2-9}\)

Answer 1

Giải phương trình

a, 5x(x-4)-5x² = 2 (11-x)

\(\Leftrightarrow5x^2-20x-5x^2=22-2x\)

\(\Leftrightarrow-18x=22\)

\(\Leftrightarrow x=\frac{-22}{18}\)

b, \(\frac{3}{x-3}-\frac{2}{x+3}=\frac{4x}{x^2-9}\left(x\ne\pm3\right)\)

\(\Leftrightarrow\frac{3\left(x+3\right)}{\left(x-3\right)\left(x+3\right)}-\frac{2\left(x-3\right)}{\left(x-3\right)\left(x+3\right)}=\frac{4x}{x^2-9}\)

\(\Rightarrow3x+9-2x+6=4x\)

\(\Leftrightarrow3x=15\)

\(\Leftrightarrow x=5\left(tm\right)\)

Kl: a,.........

b,.........