如果1分之x-1分之y=3,试求2x-3xy-2y分之x-2xy-y的值
问题描述:
如果1分之x-1分之y=3,试求2x-3xy-2y分之x-2xy-y的值
答
1/x-1/y=3
(y-x)/xy=3
y-x=3xy
x-y=-3xy
(x-2xy-y)/(2x-3xy-2y)
=(-3xy-2xy)/(-6xy-3xy)
=5/9