计算(5a-4b)²-2(5a-4b)(3a-2b)

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/02 21:54:32
计算(5a-4b)²-2(5a-4b)(3a-2b)

计算(5a-4b)²-2(5a-4b)(3a-2b)
计算(5a-4b)²-2(5a-4b)(3a-2b)

计算(5a-4b)²-2(5a-4b)(3a-2b)
(5a-4b)²-2(5a-4b)(3a-2b)
=25a²-40ab+16b²-30a²+44ab-16b²
=-5a²+4ab

(5a-4b)²-2(5a-4b)(3a-2b)
=(5a-4b)【(5a-4b)-2(3a-2b)]
=(5a-4b)(-a)
=-5a^2-4ab

(5a-4b)²-2(5a-4b)(3a-2b)
=25a²-40ab+16b²-30a²+44ab-16b²
=-5a²+4ab