①54×98
②(+﹣)×24
③4.86×[1÷(2.1﹣2.09)]
④8﹣
①
②36×()
③
④
⑤3.24×0.76+3.24×0.24
⑥
①(3618÷18-145)×20
②6÷ - ÷6
③(21+ )× +
④ ×[ ÷( - )]
⑤3.5×98+35×0.2