Správné: 20+30 = 50, 90-20 = 70, 5+30 = 35, 42+1 = 43, 80-7 = 73, 74-3 = 71, 26+4 = 30, 5+62 = 67, 8+51 = 59, 86-4 = 82, Nesprávné: 5+30 = 80, 90-20 = 60, 30-5 = 40, 86-4 = 46, 26+4 = 20, 17-9 = 9,

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