Đáp án:
a) $79 + 65 = 79 + (61 + 4) = (79 + 61) + 4 = 140 + 4 = 144$
b) $996 + 45 = 996 + (4 + 41) = (996 + 4) + 41 = 1000 + 41 = 1041$
c) $37 + 198 = (35 + 2) + 198 = 35 + (2 + 198) = 35 + 200 = 235$
d) $3492 + 319 = 3492 + (318 + 1) = (3492 + 318) + 1 = 3810 + 1 = 3811$