1/X-1/2Y=1/3
6y-3x=2xy
2y-x=2/3xy
x-2y=-2/3xy
所以(2X+3XY-4Y)/(X-3XY-2Y)
=[2(x-2y)+3xy]/[(x-2y)-3xy]
=[2*(-2/3xy)+3xy]/(-2/3xy-3xy)
=(5/3xy)/(-11/3xy)
=-5/11
1/X-1/2Y=1/3
6y-3x=2xy
2y-x=2/3xy
x-2y=-2/3xy
所以(2X+3XY-4Y)/(X-3XY-2Y)
=[2(x-2y)+3xy]/[(x-2y)-3xy]
=[2*(-2/3xy)+3xy]/(-2/3xy-3xy)
=(5/3xy)/(-11/3xy)
=-5/11