答：
x-2y=2014
[（3x+2y)(3x-2y)-（x+2y）×（5x-2y）]÷8x
=[9x²-4y²-(5x²+8xy-4y²)]÷(8x)
=(4x²-8xy)÷(8x)
=(x-2y)/2
=2014/2
=1007