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

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

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

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