-1/3-(-5/2)+(13/4)-(+31/6)

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-1/3-(-5/2)+(13/4)-(+31/6)-1/3-(-5/2)+(13/4)-(+31/6)-1/3-(-5/2)+(13/4)-(+31/6)-1/3-(-5/2)+(13/4)-(+3

-1/3-(-5/2)+(13/4)-(+31/6)
-1/3-(-5/2)+(13/4)-(+31/6)

-1/3-(-5/2)+(13/4)-(+31/6)
-1/3-(-5/2)+(13/4)-(+31/6)
=-1/3+(5/2)+(13/4)-(31/6)
=[-1/3-(31/6)]+[(5/2)+(13/4)]
=[-2/6-(31/6)]+[10/4+(13/4)]
=29/6+23/4
=(29×4+23×6)/(4×6)
=254/24
=127/12
希望能够帮助你,有疑问欢迎追问,

-1/3-(-5/2)+(13/4)-(+31/6)
=-1/3+5/2+13/4-31/6
=-(1/3+31/6)+5/2+13/4)
=-33/6+23/4
=(-66+69)/12
=3/12
=1/4