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

问题描述:

(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