4.73-【2又2/3-(1又4/5+2.63)】-1/3

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4.73-【2又2/3-(1又4/5+2.63)】-1/3

4.73-【2又2/3-(1又4/5+2.63)】-1/3
4.73-【2又2/3-(1又4/5+2.63)】-1/3

4.73-【2又2/3-(1又4/5+2.63)】-1/3
4.73-8/3+9/5+2.63-1/3
4.73+2.632-(8/3+1/3)+9/5
=7.162

有问问题的功夫,这道题早算好了