9+99+999 8×(125-20) 17+17×99
①
②36×()
③
④
⑤3.24×0.76+3.24×0.24
⑥
①216÷(18×6)
② × + ÷
③( - )× ×36
④125%×2.5×3.2
⑤4.67-(0.67+2.98)
⑥ ÷[2÷( - )]