1/x-1/y=3 2X+3XY-2Y/X-2XY-Y=

问题描述:

1/x-1/y=3 2X+3XY-2Y/X-2XY-Y=

1÷x-1÷y=3
y-x=3xy
(2x+3xy-2y)÷(x-2xy-y)
=(2(x-y)+3xy)÷((x-y)-2xy)
=(-6xy+3xy)÷(-3xy-2xy)
=-3xy÷(-5xy)
=3/5