①
②
③
①4.05÷0.81+2.4
②4.85×8×1.25
③31.9×8-0.8×19
④
⑤
⑥
9.6-9.6×
56× 1.25××80×1.3
①250-250÷25×2
②18÷ ×
③5.2÷0.4÷2.5
④(34- )÷17
⑤4.3×1.75-1.75+ ×6.7
⑥ ×[(72.8-69.6)÷ ]
②36×()
⑤3.24×0.76+3.24×0.24