①42×17÷7
②36×24﹣4
③(810﹣162)÷9
④515﹣15×3
①
②
③
①(3618÷18-145)×20
②6÷ - ÷6
③(21+ )× +
④ ×[ ÷( - )]
⑤3.5×98+35×0.2