(-121.4)+(-78.5)-(-8又2分之1)-(-121.4)

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(-121.4)+(-78.5)-(-8又2分之1)-(-121.4)(-121.4)+(-78.5)-(-8又2分之1)-(-121.4)(-121.4)+(-78.5)-(-8又2分之1)-(-1

(-121.4)+(-78.5)-(-8又2分之1)-(-121.4)
(-121.4)+(-78.5)-(-8又2分之1)-(-121.4)

(-121.4)+(-78.5)-(-8又2分之1)-(-121.4)
(-121.4)+(-78.5)-(-8又2分之1)-(-121.4)
=(-121.4)-(-121.4)+(-78.5)-(-8又2分之1)
=-121.4+121.4+(-78.5)-(-8又2分之1)
=(-78.5)-(-8又2分之1)
=-78.5+8.5
=-70

-70