Question

Упростите выражение $frac{1}{z+2}- frac{2}{3z}$

Answer 1

$frac{1}{z+2} - frac{2}{3z} = frac{3z*1}{3z*(z+2)} - frac{(z+2)*2}{(z+2)*3z} = frac{3z-(z+2)*2}{3z*(z+2)} = frac{3z-2z-4}{3z*(z+2)} = frac{z-4}{3z^2+6z}$