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+2.63+1.8-(2又2/3+1/3)
=9.16-3
=6.16

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