因式分解x立方-2x平方y+xy立方②(x平方-5)平方-8(5-x平方)+16,
问题描述:
因式分解x立方-2x平方y+xy立方②(x平方-5)平方-8(5-x平方)+16,
答
x³-2x²y+xy³
=x﹙x²-2xy+y²﹚
=x﹙x-y﹚²
﹙x²-5﹚²-8﹙5-x²﹚+16
=﹙x²-5﹚²+8﹙x²-5﹚+16
=﹙﹙x²-5﹚+4﹚²
=﹙x²-1﹚²
=﹙﹙x-1﹚﹙x+1﹚﹚²
=﹙x-1﹚²﹙x+1﹚²