Helyes: 10+5=15, 20+10=30, 27-20=7, 35-30=5, 20+5=25, 18-8=10, 59-50=9, 70+7=77, 39-1=38, 45+1=46, 93-90=3, Helytelen: 43-3=4, 80+9=98, 27-20=70, 56+1=66, 35-30=65, 45-1=43, 56-6=5, 47+1=46, 30+5=53,

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