5. Выполни действия.

600:20-5×2 = 30-10 = 20; 600:(20-5)×2 = 600:15×2 = 40×2 = 80; 128:4+3+5×3 = 32+3+15 = 50; 128:4×(3+5)-3 = 32×8-3 = 256-3 = 253; 54:(9-3):(72:36) = 54:6:2 = 4.5; 54:9-(72:36) = 6-2 = 4.