①192÷3÷2
②328÷2÷4
③920÷4÷2
④192÷(3×2)
⑤328÷(2×4)
⑥336÷7÷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)÷ ]