求解;一 (x-8y)(x-y)二 (Y+2)(Y-2)-(Y-1)(Y+5)三 (3X+4)(3X-4)-(2X+3)(3X-2)
问题描述：
求解;一 (x-8y)(x-y)二 (Y+2)(Y-2)-(Y-1)(Y+5)三 (3X+4)(3X-4)-(2X+3)(3X-2)
麻烦写一下详细的解答过程,谢谢
答
1)(x-8y)(x-y)
=x^2-9xy+8y^2
2)(Y+2)(Y-2)-(Y-1)(Y+5)
=y^2-4-(y^2+4y-5)
=-4y+1
3)(3X+4)(3X-4)-(2X+3)(3X-2)
=9x^2-16-(6x^2+5x-6)
=3x^2-5x-10