24-4= - 20 , 53-3= - 50, 79-9= - 70, 85-5= - 80, 96-6= - 90, 50+4= - 54, 70+3= - 73, 80+1= - 81, 10+7= - 17, 19-9= - 10, 45-5= - 40, 66-6= - 60, 60+8= - 68, 20+9= - 29, 80+5= - 85, 70+6= - 76,

Zbrajanje i oduzimanje 24-4,20+4 (2.r)

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