2017÷2017又2017/2018+1/2019简便计算
=2017÷[2017x(1+1/2018)]+1/2019
=2017÷2017÷2019/2018+1/2019
=1÷2019/2018+1/2019
=2018/2019+1/2019
=1
2017÷ 2017又2017/2018+1/2019
=2017÷[2017×(1+1/2018)]+1/2019
=2017÷2017÷2019/2018+1/2019
=2018/2019+1/2019
=1
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