题目

脱式计算。 (1) (12.5-2.5)÷2.5 (2) 15.8-0.8÷0.5×4 (3) 8.26×25-42.6×2.5 答案: (12.5-2.5)÷2.5 =10÷2.5 =4 15.8-0.8÷0.5×4 =15.8-1.6×4 =15.8-6.4 =9.4 8.26×25-42.6×2.5 =82.6×2.5-42.6×2.5 =2.5×(82.6-42.6) =2.5×40 =100
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