1/X-1/Y=3,试求(2X-3XY-2Y)/(X-2XY-Y)的值
1/X-1/Y=3,试求(2X-3XY-2Y)/(X-2XY-Y)的值
参考答案:1/X-1/Y=3
y-x=3xy
x-y=-3xy
原式=(-3xy-6xy)/(-3xy-2xy)
=-9xy/-5xy
=9/5
1/X-1/Y=3,试求(2X-3XY-2Y)/(X-2XY-Y)的值
参考答案:1/X-1/Y=3
y-x=3xy
x-y=-3xy
原式=(-3xy-6xy)/(-3xy-2xy)
=-9xy/-5xy
=9/5