Točno: 10+7=17, 3+10=13, 6+10=16, 10+4=14, 10+2=12, 16-6=10, 18-8=10, 10+5=15, 12-2=10, Netočno: 9+10=18, 4+10=15, 15-5=11, 14-4=9, 19-9=9, 13-3=13,

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