①535-384+279
②74+436-298
③422+233-195
④634-267-346
35÷5=
6×4=
45+23=
24÷8=
87-71=
75-9=
54-6=
9×8=
①9×(3+2)
②35+14÷7
③45-5÷5
④(16+32)÷8
②22÷3
③20.2÷6
④28.28÷4