ВЕРНО!: 50 + 50 = 100, 100 - 20 = 80, 40 + 30 = 70, 50 - 20 = 30, 80 - 20 = 60, 100 - 70 = 30, 70 - 20 = 50, 40 - 30 = 10, 20 + 60 =80, 70 - 50 = 20, НЕ ПОДУМАЛ!: 50 + 50 = 10, 100 - 20 = 60, 40 + 30 = 80, 50 - 20 = 70, 80 - 20 = 100, 100 - 70 = 20, 70 - 20 = 90, 40 - 30 = 70, 60 - 20 = 80, 70 - 20 = 90,

СЛОЖЕНИЕ И ВЫЧИТАНИЕ КРУГЛЫХ ДЕСЯТКОВ

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