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Efectueaza: 3×3+19-4×4=; 6×4+3×4-5=; 8×5-3×2+7=; 5×9-4-3×7=; 36:9+5×8-13=; 64:8+56:8-3=; 54:9:3+8=; 72:8×5-4=

Răspuns :

a) 9+19-16=28-16=12 b) 24+ 12-5=36-5=31 c) 40-6+7=39 d) 45-4-21=20 e)4+40-13=31f)8+7-3=12 g)2+8=10 h)45-4=41