Corretto: + 54 - 33 = +21, + ( +46 - 30) = +4, + 65 x ( -10) = - 650, - ( -30 -40)= +70, 120 x ( -10) = - 1200, Errato: + 32 x (- 10)= +22, - ( +4 +3 - 5)= +2, 100 x ( - 10) = + 1000, - ( 45 -10)= +35, - ( 34 - 10) = +24,

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