①6.54÷0.4÷2.5
②18.6÷0.6×2.3
③(4.2+1.32)÷0.8
④1.25×1.37×8
⑤2.5×6.3+3.7×2.5
⑥6.8-2.8÷14
①
②6.875﹣
③372÷25÷0.4
④77×