(-5.5)+(-4.8)+(+2.4)+(+8.1) =

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(-5.5)+(-4.8)+(+2.4)+(+8.1)=(-5.5)+(-4.8)+(+2.4)+(+8.1)=(-5.5)+(-4.8)+(+2.4)+(+8.1)=(-5.5)+(-4.8)+(+

(-5.5)+(-4.8)+(+2.4)+(+8.1) =
(-5.5)+(-4.8)+(+2.4)+(+8.1) =

(-5.5)+(-4.8)+(+2.4)+(+8.1) =
(-5.5)+(-4.8)+(+2.4)+(+8.1)
=-5.5-4.8+(2.4+8.1)
=-10.3+10.5
=0.2

原式=-10.3+10.5=0.2

(-5.5)+(-4.8)+(+2.4)+(+8.1) =(8.1+2.4)-(5.5+4.8)=10.5-10.3=0.2

=0.2

5.5+4.8+2.4+8.1
=20.8