已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值.

问题描述:

已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值.

原式=(9x²-4y²-5x²-8xy+4y²)÷4x
=(4x²-8xy)÷4x
=x-2y
=2011