(3a-b+5)(3a+b-5) (要用简便)

来源:学生作业帮助网 编辑:六六作业网 时间:2024/05/09 02:57:00
(3a-b+5)(3a+b-5)(要用简便)(3a-b+5)(3a+b-5)(要用简便)(3a-b+5)(3a+b-5)(要用简便)=(3a)^2-(b-5)^2=9a^2-b^2-10b+25原式=

(3a-b+5)(3a+b-5) (要用简便)
(3a-b+5)(3a+b-5) (要用简便)

(3a-b+5)(3a+b-5) (要用简便)
=(3a)^2-(b-5)^2
=9a^2-b^2-10b+25

原式=[3a-(b-5)][3a+(b+5)]=9a^2-(b-5)^2=9a^2-b^2+10b-25

(3a-b+5)(3a+b-5)=(3a-(b-5))(3a+b-5)=9a^2-(b-5)^2=9a^2-b^2+10b-25