(3a²-4a+5)(3a²+4a-5)-a²(9a²-16)

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 14:41:21
(3a²-4a+5)(3a²+4a-5)-a²(9a²-16)(3a²-4a+5)(3a²+4a-5)-a²(9a²-1

(3a²-4a+5)(3a²+4a-5)-a²(9a²-16)
(3a²-4a+5)(3a²+4a-5)-a²(9a²-16)

(3a²-4a+5)(3a²+4a-5)-a²(9a²-16)
(3a²-4a+5)(3a²+4a-5)-a²(9a²-16)
=[3a²-(4a-5)][3a²+(4a-5)]-a²(9a²-16)
=9a^4-(4a-5)²-9a^4+16a²
=16a²-(4a-5)²
=(4a+4a-5)(4a-4a+5)
=5(8a-5)
=40a-25