rezolvă respectând ordinea

6+36-42=42-42=0
0+42-36=42-36=6
4:2•9:3•6:4=2•9:3•6:4=18:3•6:4=6•6:4=36:4=9
27-18-8=9-8=1
4-3+8=1+8=9
8•3:6=24:6=4
(•=×)