134 - 98 - 2 = 134 - (98 + 2) = 134 - 100 = 34
580 - 79 - 21 = 580 -(79+21) = 580 - 100 = 480
83 × 9 - 73 × 9 = 9 × (83 - 73) = 9 × 10 = 90
7 × 38 - 7 × 28 = 7 × (38 - 28) = 7 × 10 = 70
24 × 96 - 24 × 86 = 24 × (96 - 86) = 24 × 10 = 240
716 × 52 - 616 × 52 = (716 -616) × 52 = 10 × 52 = 520
пожалуйста, все надеюсь верно, если нет пиши.