-[-a]+[-b]-[-c]-d,其中a=-1/3,B=3/4,C=-1/2,D=5/12

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-[-a]+[-b]-[-c]-d,其中a=-1/3,B=3/4,C=-1/2,D=5/12

-[-a]+[-b]-[-c]-d,其中a=-1/3,B=3/4,C=-1/2,D=5/12
-[-a]+[-b]-[-c]-d,其中a=-1/3,B=3/4,C=-1/2,D=5/12

-[-a]+[-b]-[-c]-d,其中a=-1/3,B=3/4,C=-1/2,D=5/12
-[-a]+[-b]-[-c]-d
=a-b+c-d
=(-1/3)-3/4+(-1/2)-5/12
=-1/3-3/4-1/2-5/12
=-2