2的整式加减

问题描述:

2的整式加减
求下列整式的值:
(XY-2分子3Y-2分子1)-(XY-2分子3Y+1),其中X=3分子10,Y=3分子8
.请你们把怎么算式写在上面

xy - 3y/2 - 1/2 - xy + 1/2 - 1 = (1-1)xy - 3y/2 + (1/2 - 1/2 - 1) = 0 + (-3y/2) + (-1)= 0 + (-3 × 3/8 × 1/2)+ (-1)= - 25/16