Răspuns:
11. 5×5×10-(13+7×8)=5×5×10-(13+56)=5×5×10-69=25×10-69=250-69=81
12. 50×2+6×5-(27÷9+6×8)=50×2+6×5-(3+6×8)=50×2+6×5-(3+48)=100+6×5-51=100+30-51=130-51=79
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