问题
计算题
分解因式:
(1)a3﹣a;
(2)x2﹣2xy+y2﹣1;
答案
解:(1)a3﹣a,
=a(a2﹣1),
=a(a+1)(a﹣1).
(2)x2﹣2xy+y2﹣1,
=(x2﹣2xy+y2)﹣1,
=(x﹣y)2﹣1,
=(x﹣y+1)(x﹣y﹣1).
分解因式:
(1)a3﹣a;
(2)x2﹣2xy+y2﹣1;
解:(1)a3﹣a,
=a(a2﹣1),
=a(a+1)(a﹣1).
(2)x2﹣2xy+y2﹣1,
=(x2﹣2xy+y2)﹣1,
=(x﹣y)2﹣1,
=(x﹣y+1)(x﹣y﹣1).