(x²+x+1)(x²-x+1) 计算 (3a+b-2)(3a-b+2)
问题描述:
(x²+x+1)(x²-x+1) 计算 (3a+b-2)(3a-b+2)
答
(x²+x+1)(x²-x+1)
=(x²+1)²-x²
=x^4+x²+1
(3a+b-2)(3a-b+2)
=9a²-(b-2)²
=9a²-b²+4b-4