首页
注册 | 登录

计算:(1)(-7x2-8y2)•(-x2+3y2)=______;(2)(3x-2y)(y-3x)-(2x-y)(3x+y)=______.

计算:
(1)(-7x2-8y2)•(-x2+3y2)=______;
(2)(3x-2y)(y-3x)-(2x-y)(3x+y)=______.
分类:数学 2016-12-07 共 2 个回复
最佳回复
(1)(-7x2-8y2)•(-x2+3y2),
=7x4-21x2y2+8x2y2-24y4
=7x4-13x2y2-24y4
(2)(3x-2y)(y-3x)-(2x-y)(3x+y),
=3xy-9x2-2y2+6xy-(6x2+2xy-3xy-y2),
=-9x2-2y2+9xy-6x2+xy+y2
=-15x2-y2+10xy.


2020 及时作业本 webmaster#jeepfushi.net
10 q. 0.008 s.
湘ICP备19005923号