①484-9×3
②(99-78)÷3
③298+(223-165)
①0.53×2.5+
②25×0.032×12.5
③ [()×]
④6.83+17.9﹣0.83+32.1
①
②36×()
③
④
⑤3.24×0.76+3.24×0.24
⑥