①240÷2×3
②819÷(3×3)
③680-80÷4
④732÷4+259
①54×98
②(+﹣)×24
③4.86×[1÷(2.1﹣2.09)]
④8﹣
①(3618÷18-145)×20
②6÷ - ÷6
③(21+ )× +
④ ×[ ÷( - )]
⑤3.5×98+35×0.2