Пошаговое объяснение:
1) ab + ac = a(b + c)
44 × 15 + 56 × 15 = 15(44 + 56) = 15 × 100 = 1 500
2)
(94 + 145) + 55 = 94 + (145 + 55) = 94 + 200 = 294
3)
25 × 89 × 4 = 25 × 4 × 89 = 100 × 89 = 8 900
4)
427 - 33 - 27 = (427 - 27) - 33 = 400 - 33 = 367
