①88+235+212
②910-(33+17)×16
③800-248-152
④940×[128-(54+67)]
⑤3600÷25÷4
⑥34×38+38×66
1÷(2÷3)÷(3÷4)÷(4÷5)÷(5÷6)
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)÷ ]