a)
[(17+7:7):8+(72:9)-(50:10)]=
[(17+1):8+8-5]=18:8+3=18/8+3
(aici cred ca ai copiat gresit, cred ca prima paranteza trebuia impartita la 3 sau la 6, ca sa obtinem 18:3+3=9 sau 18:6+3=6) daca ''a'' ar fi 6 sau 9
b)
[(452-275):3+(107x4-25x4-9x3)]=
[177:3+(428-100-27)]=
59+301=360
daca a =3
b:a=360: 3=120
daca a=6
b:a=360: 6=60