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