①56﹣49+38
②27÷3×4
③12+18÷6
④54﹣7×3
⑤7×(24﹣18)
⑥(39+25)÷8
(59﹣50)×3
30+31+8
76﹣6×8
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)÷ ]
①15.28﹣3.6﹣3.4
②()×7.2
③
④7.5÷[(6.8﹣4.3)×0.12]