问题
填空题
在实数范围内分解因式:x2-2x-1=______.
答案
x2-2x-1,
=x2-2x+1-2,
=(x-1)2-2,
=(x-1+
)(x-1-2
).2
故答案为:(x-1+
)(x-1-2
).2
在实数范围内分解因式:x2-2x-1=______.
x2-2x-1,
=x2-2x+1-2,
=(x-1)2-2,
=(x-1+
)(x-1-2
).2
故答案为:(x-1+
)(x-1-2
).2