Вычисли наиболее удобным способом:
(397 + 54) + 3
14 + (86 + 478)
32 + 21 + 79 + 168
45 + 399 + 255 + 1
426 + (18 + 74) + 38
(63 + 59) + (7 + 841)
(397 + 54) + 3 = (397 + 3) + 54 = 400 + 54 = 454
14 + (86 + 478) = (14 + 86) + 478 = 100 + 478 = 578
32 + 21 + 79 + 168 = (32 + 168) + (21 + 79) = 200 + 100 = 300
45 + 399 + 255 + 1 = (45 + 255) + (399 + 1) = 300 + 400 = 700
426 + (18 + 74) + 38 = (426 + 74) + (18 + 38) = 500 + 56 = 556
(63 + 59) + (7 + 841) = (63 + 7) + (59 + 841) = 70 + 900 = 970