Question

Реши неравенство −(3d+6)+(d−7)<0

Answer 1

$- (3d + 6) + (d - 7) < 0 \ - 3d - 6 + d - 7 < 0 \ - 2d - 13 < 0 \ - 2d < 13 \ - d < frac{13}{2} \ d > - frac{13}{2} \ d > - 6.5$

Ответ:

$d in ( - 6.5; + infty )$