Ответы на вопрос:
А) 68 - 19 = (60 + 8) - (10 + 9) = 50 - 1 = 49 г) 47 - 29 = (40 + 7) - (20 + 9) = 20 - 2 = 18 ж) 200 - 97 = (190 + 10) - (90 + 7) = 100 + 3 = 103 к) 606 - 399 = (590 + 16) - (390 + 9) = 200 + 7 = 207
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