问题
解答题
把下列多项式因式分解
①ab2-2ab+a
②x2-y2-2y-1
答案
①ab2-2ab+a,
=a(b2-2b+1),
=a(b-1)2;
②x2-y2-2y-1,
=x2-(y2+2y+1),
=x2-(y+1)2,
=(x-y-1)(x+y+1).
把下列多项式因式分解
①ab2-2ab+a
②x2-y2-2y-1
①ab2-2ab+a,
=a(b2-2b+1),
=a(b-1)2;
②x2-y2-2y-1,
=x2-(y2+2y+1),
=x2-(y+1)2,
=(x-y-1)(x+y+1).