147. Вычислите сумму удобным способом:
184 + 675; б) 321 + 337 + 363; в) 234 + 456 + 166
r 448 + 323 + 52 + 77; д)123 +978 + 277 + 22; е) 511 + 245 + 855 + 89.
Образец: а) 325 + 484 + 675 = (325 + 675) + 484 = 1000 + 484 = 1484​
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