(xy-3/2y-1/2)-(xy-3/2x+1),其中x=10/3,y=8/3.,急啊.求以上整式的值_数学解答

(xy-3/2y-1/2)-(xy-3/2x+1),其中x=10/3,y=8/3.,急啊.
求以上整式的值

人气：398 ℃　时间：2019-10-17 17:51:03

解答

(xy-3/2y-1/2)-(xy-3/2x+1)
=xy-3/2y-1/2-xy+3/2x-1
=-3/2y-1/2+3/2x-1
=3/2(x-y)-3/2
=3/2*2/3-3/2
=-1/2