(X+1)(X-1)-(X-3)²
问题描述:
(X+1)(X-1)-(X-3)²
答
原式=(x²-1)-(x²-6x+9)
=x²-1-x²+6x-9
=6x-10
(X+1)(X-1)-(X-3)²
原式=(x²-1)-(x²-6x+9)
=x²-1-x²+6x-9
=6x-10