(3a-5b-2c)(-3a-5b+2c)

分类: 作业答案 • 2021-12-19 17:50:55

问题描述：

答

(3a-5b-2c)(-3a-5b+2c)
=[-5b+(3a-2c)]*[-5b-(3a-2c)]
=25b²-(3a-2c)²
=25b²-9a²-4c²+12ac

答

(3a-5b-2c)(-3a-5b+2c)
＝[-5b+(3a-2c)][-5b-(3a-2c)]
=（-5b)²-(3a-2c)²
= 25b²-(9a²-12ac+4c²)
=25b²-9a²+12ac-4c²