Răspuns:
(5+4)×9=
9×9=81
sau
(5×9)+(4×9)=81
(7+2)×8=
9×8=72
(7×8)+(2×8)=72
(8-3)×7=
5×7=35
(8×7)-(3×7)=35
(9-5)×6=
4×6=24
(9×6)-(5×6)=24