Correto: 10÷5=2, 30%=0,3, 3×8=24, 4+2×9÷2=27, 5×5=25, 100÷10=10, 9×3-5=22, 78-20=58, √49=7, (-3)×(-6)=18, Incorreto: 14÷7=3, (-2)×2=4, (-3)×(-5)=15, 7×7×7=27, (-5)-8=3, 24÷4=4, √16=2, (-7)×6=42, (-50)÷20=2.5, 5×(-7)=35,

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