-0.5-[-3.25]+2.75-7.5=

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-0.5-[-3.25]+2.75-7.5=-0.5-[-3.25]+2.75-7.5=-0.5-[-3.25]+2.75-7.5=原式=-0.5+3.25+2.75-7.5=2.75+2.75-7.

-0.5-[-3.25]+2.75-7.5=
-0.5-[-3.25]+2.75-7.5=

原式=-0.5+3.25+2.75-7.5
=2.75+2.75-7.5
=5-7.5
=-2.5