-(-1又1/2)+(-1又1/4)+(+3又3/4)+(-0.25)-(+3.75)-4.5
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-(-1又1/2)+(-1又1/4)+(+3又3/4)+(-0.25)-(+3.75)-4.5-(-1又1/2)+(-1又1/4)+(+3又3/4)+(-0.25)-(+3.75)-4.5-(-1又1
-(-1又1/2)+(-1又1/4)+(+3又3/4)+(-0.25)-(+3.75)-4.5
-(-1又1/2)+(-1又1/4)+(+3又3/4)+(-0.25)-(+3.75)-4.5
-(-1又1/2)+(-1又1/4)+(+3又3/4)+(-0.25)-(+3.75)-4.5
-(-1又1/2)+(-1又1/4)+(+3又3/4)+(-0.25)-(+3.75)-4.5
=1.5-1.25+3.75-0.25-3.75-4.5
=1.5-4.5-1.25+3.75-0.25-3.75
=-3-1.5
=-4.5
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