Question

Упростите вырожение $frac{3}{x-3} - frac{x+15}{x ^{2}-9 } - frac{2}{x}$

Answer 1

3/(x-3)-(x+15)/(x-3)(x+3)-2/x=(3x²+9x-x²-15x-2x²+18)/x(x-3)(x+3)=
=18-6x)/x(x-3)(x+3)=6(3-x)/x(x-3)(x+3)=-6/x(x+3)