987-(287+135)
478-256-144
672-36+ 64
36+64-36+64
487-287-139-61
399+598
2000-368-132
473+79-63
①450÷9×31
②380-725÷5
③(250-45×4)×8
④600÷[(11+25)÷9]
3840÷[(200-192)×8]
(338+565-204)÷3
(4800÷75+36)×35
1520-(970+38×2)
30+(100-16×5)
(285-15+20)×3
(1070+28×289)÷18
3789+127-3789+73
①(3618÷18-145)×20
②6÷ - ÷6
③(21+ )× +
④ ×[ ÷( - )]
⑤3.5×98+35×0.2