已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值2.(a^2-b^2)÷(b-a)的结果是?3.x^my^n÷1/4x^3y=4x^2,则M=?n=?

问题描述:

已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值
2.(a^2-b^2)÷(b-a)的结果是?
3.x^my^n÷1/4x^3y=4x^2,则M=?n=?