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问题: 小学数学题

脱式计算:
1、[1.9+1.9×(1.9-1.9)]÷0.38

解答:

1、[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