Question

x分之一减去y分之一等于3,求x-2xy-y分之2x+3xy-2y的值

Answer 1

1/x-1/y=3

(2x+3xy-2y)/(x-2xy-y)

=(2/y+3-2/x)/(1/y-2-1/x)

=(-6+3)/(-3-2)

=3/5