a) 371 + (246 + 229) = 371 + 475 = 846
b) 634 + 258 + 166 = 634 + (258 + 166) = 634 + 424 = 1058
c) 327 + 228 + 173 + 272 = (327 + 173) + (228 + 272) = 500 + 500 = 1000
a) (256 + 343) - 156 = 599 - 156 = 443
b) (384 + 237) - 137 = 621 - 137 = 484
c) 495 - (157 + 295) = 495 - 452 = 43
g) 929 - (129 + 498) = 929 - 627 = 302
a) (x + 29) + 71 = x + (29 + 71) = x + 100
b) c + 732 + 968 = c + (732 + 968) = c + 1700
c) 824 - (189 + a) = 635 - a