- а) 66 + 35 + 14 + 65 + 17 = (66 + 14) + (35 + 65) + 17 = 80 + 100 + 17 = 197
- б) (100 + 6) ⋅ 12 = 100 ⋅ 12 + 6 ⋅ 12 = 1200 + 72 = 1272
- в) 289 ⋅ 3 = 867
- г) 287 ⋅ 26 − 187 ⋅ 26 = 26 ⋅ (287 − 187) = 26 ⋅ 100 = 2600
- д) 8742 − (600 + 742) = 8742 − 1342 = 7400
Ответ: а) 197; б) 1272; в) 867; г) 2600; д) 7400