(-2.5)-(2,1/4)+2,1/3
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(-2.5)-(2,1/4)+2,1/3(-2.5)-(2,1/4)+2,1/3(-2.5)-(2,1/4)+2,1/3(-2.5)-(2又1/4)+2又1/3=2.5-2又1/4+2又1/3=2又6
(-2.5)-(2,1/4)+2,1/3
(-2.5)-(2,1/4)+2,1/3
(-2.5)-(2,1/4)+2,1/3
(-2.5)-(2又1/4)+2又1/3
=2.5-2又1/4+2又1/3
=2又6/12-2又3/12+2又4/12
=(2-2+2)+(6/12-3/12+4/12)
=2+7/12
=2又7/12