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

1)5*5=25
2)45:9*6=30
3)90-36+46=9
4)35+32=67

40:8х(74-65) = 5 [40:8=5] х9 [74-65=9] = 45
45:(80-71)х6 = 5 [45:9=5] [80-71=9] x6 = 30
90-9x4+46 = 24 [9x4=36] [90-36=24] +46 = 70
7x5+4x8 = 67 [7x5=35] [4x8=32] [32+35=67]