VERIFICA DI ARITMETICA
N 1 161−481+61−241+31+61=
N 2 2716−547+32−(91+181+21−61)=
N 3 87−(121+61)+41=
N 4 97−[121−(201−451)]=
N 5 56×32 =
N 6 283×712=
N 7 d327÷83 =
N 8 1120×74÷148=
