①(+-)×36
②(12.6-÷)×
③2÷+×30
④+×-
⑤24÷(-)
⑥÷[×(-)]
①+8× ②×-×
③-86× ④36×(+-)
①89×
②
③
④×6.8+4.2×4.75-4.75
⑤
①(3618÷18-145)×20
②6÷ - ÷6
③(21+ )× +
④ ×[ ÷( - )]
⑤3.5×98+35×0.2
①36×()
②1.3×37.5%+2.7×
③ [()]
④13÷()×