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:2024/07/12 21:34:46
x){nu0M5IzSMZI4N51mI֣_`gCM52M*31HL64Kr
&&Ip 6]Slb~qAb6`i>n giUiBi@5t5ᮈ3ҥ ̴
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