已知:X方-2X-2=0 ,先化简再求值 :(X-1)方+(X+3)(X-3)+(X-3)(X-1)

问题描述:

已知:X方-2X-2=0 ,先化简再求值 :(X-1)方+(X+3)(X-3)+(X-3)(X-1)
是多项式乘法的题目

原式=x²-2x+1+x²-9+x²-4x+3
=3x²-6x+4
=3x²-6x-6+6+4
=3(x-2x-2)+10
=10