求解答 3(x²+2)-3(x+1)(x-1)
问题描述:
求解答 3(x²+2)-3(x+1)(x-1)
答
3(x²+2)-3(x+1)(x-1)
=(3x²+6)-3(x²-1)
=3x²+6-3x²+3
=9