40:8•(74-65) 45:(80-71)•6 90-9•4+46 7•5+4•8 решите пожалуйста.спасибо.

40:8х(74-65) = 5 [40:8=5] х9 [74-65=9] = 4545:(80-71)х6 = 5 [45:9=5] [80-71=9] x6 = 3090-9x4+46 = 24 [9x4=36] [90-36=24] +46 = 707x5+4x8 = 67 [7x5=35] [4x8=32] [32+35=67]