(-0.25)—(-4/13)+2.75-(+2/15)

(-0.25)—(-4/13)+2.75-(+2/15)

(-0.25)—(-4/15)+2.75-(+2/15)

= -0.25+4/15+2.75-2/15
= -0.25+2.75+4/15-2/15
= 2.5+2/15
= 2+15/30+4/30
= 2又30分之19

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