25X4分之3-25X-(0.5)-(-4分之1)X(-25)=

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25X4分之3-25X-(0.5)-(-4分之1)X(-25)=25X4分之3-25X-(0.5)-(-4分之1)X(-25)=25X4分之3-25X-(0.5)-(-4分之1)X(-25)=25X4

25X4分之3-25X-(0.5)-(-4分之1)X(-25)=
25X4分之3-25X-(0.5)-(-4分之1)X(-25)=

25X4分之3-25X-(0.5)-(-4分之1)X(-25)=
25X4分之3-25X-(0.5)-(-4分之1)X(-25)
=25X4分之3+25X0.5-4分之1X25
=25X(4分之3+0.5-4分之1)
=25X1
=25

25X4分之3-25X(-0.5)-(-4分之1)X(-25)
=25X4分之3+25X0.5-25×4分之1
=25×(4分之3-4分之1+0.5)
=25×1
=25