Решительно неравенство -15/(x+1)²-3≥0
-15-3(x+1)^2≥(x+1)^2 -15-3(x^2+2x+1)≥x^2+2x+1 -15-3x^2-6x-3≥x^2+2x+1 -15-3x^2-6x-3-x^2-2x-1≥0 -4x^2-8x-19≥0 x(-4x-8)-19≥0 x≥0 -4x-8-19≥0 -4x-27≥0 -4x≥27 x≤-6.75 _____________0////////> \\\\\\\\-6.75_____> x∉0