63÷(54-45) 3×(15-9) 3000-600+800
35+5-13 81÷9×5 92-6×9
18+(36-6) (59-5)÷6 7×(31-23)
①9×(3+2)
②35+14÷7
③45-5÷5
④(16+32)÷8