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问题: 小学数学题

脱式计算:
1、18.65-5×1.73 2、[1.9+1.9×(1.9-1.9)]÷0.38
2、9.1÷0.013×13.5 3、5020×80÷(139-99)

解答:

1、18.65-5×1.73
  =18.65-8.65
  =10
2、[1.9+1.9×(1.9-1.9)]÷0.38
=[1.9+1.9×0]÷0.38
=[1.9+0]÷0.38
=1.9÷0.38
=5
3、9.1÷0.013×13.5
=700×13.5
=9450
4、5020×80÷(139-99)
=401600÷40
=10040