问题
填空题
分解因式:x2+x-1=______.
答案
x2+x-1
=(x+
)2-1 2 5 4
=(x+
)2-(1 2
)25 2
=(x+
+1 2
)(x+5 2
-1 2
)5 2
=(x+
)(x+1+ 5 2
).1- 5 2
故答案为:(x+
)(x+1+ 5 2
).1- 5 2
分解因式:x2+x-1=______.
x2+x-1
=(x+
)2-1 2 5 4
=(x+
)2-(1 2
)25 2
=(x+
+1 2
)(x+5 2
-1 2
)5 2
=(x+
)(x+1+ 5 2
).1- 5 2
故答案为:(x+
)(x+1+ 5 2
).1- 5 2