Обчисли двома сп.47+26= 2сп.47+26= 1сп.34+58= 2сп.34+58= - вопрос №32418754726247261345823458 от mastermin 21.03.2020 01:03

Question

Математика: Обчисли двома сп.47+26= 2сп.47+26= 1сп.34+58= 2сп.34+58=

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47 + 26 = (40 + 7) + (20 + 6) = (40 + 20) + (7 + 6) = 60 + 13 = 73
47 + 26 = 47 + (3 + 23) = (47 + 3) + 23 = 50 + 23 = 73
47 + 26 = (43 + 4) + 26 = 43 + (4 + 26) = 43 + 30 = 73

34 + 58 = (30 + 4) + (50 + 8) = (30 + 50) + (4 + 8) = 80 + 12 = 92
34 + 58 = 34 + (6 + 52) = (34 + 6) + 52 = 40 + 52 = 92
34 + 58 = (32 + 2) + 58 = 32 + (2 + 58) = 32 + 60 = 92