化简代数式(x-3)(x+3)-(x-1)(x+1)
问题描述:
化简代数式(x-3)(x+3)-(x-1)(x+1)
答
(x-3)(x+3)-(x-1)(x+1)
=x^2-9-(x^2-1)
=x^2-9-x^2+1
=-8