|-1又1/4-(-2又1/3)|-(-1又1/2)=

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|-1又1/4-(-2又1/3)|-(-1又1/2)=
x)5|aokfkQ#M["}"TkӾϺ<߮tt2s}C#<;AG6

|-1又1/4-(-2又1/3)|-(-1又1/2)=
|-1又1/4-(-2又1/3)|-(-1又1/2)=

|-1又1/4-(-2又1/3)|-(-1又1/2)=
去括号,得2又7/12