9(a-b)(3a+b)²+25(a+3b)²(b-a)
问题描述:
9(a-b)(3a+b)²+25(a+3b)²(b-a)
答
9(a-b)(3a+b)²+25(a+3b)²(b-a)
=(a-b)(3a+b)²(9-25)
=-16(a-b)(3a+b)²