Răspuns
Explicație pas cu pas:
11.a. 7\9-5\12=[(4*7)-(5*3)]\36=(28-15)\36=13\36
b. 11\42-5\28=[(2*11)-(5*3)]\84=
(22-15)\84=7\84=1\12
c. 9\20-5\12=[(3*9)-(5*5)]\60=
927-25)\60=2\60=1\30
d. 5si 4\15-2si9\20=79\15-49\20=
[(4*79)-(3*49)]\60=(316-147)\60=169\60
e. 6si7\15-3si9\10=97\15-39\10=
[(2*97)-(3*39)]\30=(194-117)\30=77\30
f. 4si1\26-3si8\39=105\26-125\39=
[(105*3)-(125*2)]\78=
(315-250)\78=65\78
