72:9x(20-3x5)
80-5(8-30:5)
6+6:(8-6)+8X6-7


Răspuns :

72:9x(20-3x5)
8
×(20-15)
8×5
40

80-5(8-30:5)
80-5(8-6)
80-5
×2
80-10
70

6+6:(8-6)+8X6-7
6+6:2+48-7
6+3+41
9+41
50