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脱式计算.(能简便的要简便)12.5+7.5-12.5+7.530.3×1.2-1.2×2.0327.5÷[10-(3.6+2.9)]10.5÷0.25÷0.4÷0.1.

题目详情
脱式计算.(能简便的要简便)
12.5+7.5-12.5+7.5            
30.3×1.2-1.2×2.03
27.5÷[10-(3.6+2.9)]
10.5÷0.25÷0.4÷0.1.




▼优质解答
答案和解析
①12.5+7.5-12.5+7.5     
=12.5-12.5+(7.5+7.5)
=0+15
=15;
       
②30.3×1.2-1.2×2.03
=(30.3-2.03)×1.2
=28.27×1.2
=33924;

③27.5÷[10-(3.6+2.9)]
=27.5÷[10-6.5]
=27.5÷3.5
=7
30
35


④10.5÷0.25÷0.4÷0.1
=10.5÷0.1÷(0.25×0.4)
=105÷0.1
=1050.
30
35
303030353535;

④10.5÷0.25÷0.4÷0.1
=10.5÷0.1÷(0.25×0.4)
=105÷0.1
=1050.