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精简巧算:86×1.7-0.7×865.639-1.732-2.268(17.6+17.6+17.6+17.6)×2.525.23×4-5.23÷0.25.

题目详情
精简巧算:
86×1.7-0.7×86                         
5.639-1.732-2.268
(17.6+17.6+17.6+17.6 )×2.5              
25.23×4-5.23÷0.25.
▼优质解答
答案和解析
(1)86×1.7-0.7×86   
=86×(1.7-0.7)
=86×1
=86       
             
(2)5.639-1.732-2.268
=5.639-(1.732+2.268)
=5.639-4
=1.639

(3)(17.6+17.6+17.6+17.6 )×2.5
=17.6×(4×2.5)
=17.6×10
=176
              
(4)25.23×4-5.23÷0.25
=25.23×4-5.23×4
=(25.23-5.23)×4
=20×4
=80.