① ÷[( ﹣0.75)×60%]
②50%×2.5× ×64
③1 +4×0.75
④( )
①(4.5﹣3.2× )÷
②4.4×25
③ ×[ -( -25%)]
①(3618÷18-145)×20
②6÷ - ÷6
③(21+ )× +
④ ×[ ÷( - )]
⑤3.5×98+35×0.2