(-0.5)+3又4分之1+2.75+(-5又2分之1)

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(-0.5)+3又4分之1+2.75+(-5又2分之1)(-0.5)+3又4分之1+2.75+(-5又2分之1)(-0.5)+3又4分之1+2.75+(-5又2分之1)(-0.5)+3又4分之1+2.

(-0.5)+3又4分之1+2.75+(-5又2分之1)
(-0.5)+3又4分之1+2.75+(-5又2分之1)

(-0.5)+3又4分之1+2.75+(-5又2分之1)
(-0.5)+3又4分之1+2.75+(-5又2分之1)
=-0.5+3.25+2.75-5.5
=-0.5-5.5+3.25+2.75
=-6+6
=0