(xy-3/2y-1/2)-(xy-3/2x+1),其中x=3/10,y=3/8

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(xy-3/2y-1/2)-(xy-3/2x+1),其中x=3/10,y=3/8(xy-3/2y-1/2)-(xy-3/2x+1),其中x=3/10,y=3/8(xy-3/2y-1/2)-(xy-3/

(xy-3/2y-1/2)-(xy-3/2x+1),其中x=3/10,y=3/8
(xy-3/2y-1/2)-(xy-3/2x+1),其中x=3/10,y=3/8

(xy-3/2y-1/2)-(xy-3/2x+1),其中x=3/10,y=3/8
(xy-3/2y-1/2)-(xy-3/2x+1)
=(3/10*3/8-3/2*3/8-1/2)-(3/10*3/8-3/2*3/10+1)
=-129/80