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4
5
-
4
5
÷1=(  )
分析:在计算时,应先算除法,再算减法,注意通分计算.
解答:解:1÷
4
5
-
4
5
÷1,
=
5
4
-
4
5

=
9
20

故选:D.
点评:此题解答的关键是注意运算顺序.
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