[1又1/3减(0.2+1/3)*4.5]+13又1/2简算12又3/4-2又2/5*3又3/4/2又1/26.3/(2.6+5又1/3*1又8/7)

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[1又1/3减(0.2+1/3)*4.5]+13又1/2简算12又3/4-2又2/5*3又3/4/2又1/26.3/(2.6+5又1/3*1又8/7)
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[1又1/3减(0.2+1/3)*4.5]+13又1/2简算12又3/4-2又2/5*3又3/4/2又1/26.3/(2.6+5又1/3*1又8/7)
[1又1/3减(0.2+1/3)*4.5]+13又1/2简算
12又3/4-2又2/5*3又3/4/2又1/2
6.3/(2.6+5又1/3*1又8/7)

[1又1/3减(0.2+1/3)*4.5]+13又1/2简算12又3/4-2又2/5*3又3/4/2又1/26.3/(2.6+5又1/3*1又8/7)
[1又1/3减(0.2+1/3)*4.5]+13又1/2
=[1又1/3减8/15*4.5]+13又1/2
=4/3-2.4+13.5
=4/3+11.1
=12又13/30
12又3/4-2又2/5*3又3/4/2又1/2
=12又3/4-12/5*15/4/2.5
=12又3/4-9/2.5
=12.75-3.6
=9.15
6.3/(2.6+5又1/3*1又7/8)
=6.3/(2.6+10)
=6.3/12.6
=0.5