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若实数a满足a3+a2-3a+2=3a-1a2-1a3,则a+1a=
题目详情
若实数a满足a3+a2-3a+2=
-
-
,则a+
=______
3 |
a |
1 |
a2 |
1 |
a3 |
1 |
a |
▼优质解答
答案和解析
∵实数a满足a3+a2-3a+2=
-
-
,
∴a3+a2-3a+2-
+
+
=0,
∴a3+
+a2+
+2-3(a+
)=0,
(a+
)(a2-1+
)+(a+
)2-3(a+
)=0,
(a+
)(a2-1+
+a+
-3)=0,
∴(a+
)[(a+
)2+(a+
)-6]=0,
∴(a+
)(a+
+3)(a+
-2)=0,
而a+
≠0,
∴a+
+3=0,或a+
-2=0,
∴a+
3 |
a |
1 |
a2 |
1 |
a3 |
∴a3+a2-3a+2-
3 |
a |
1 |
a2 |
1 |
a3 |
∴a3+
1 |
a3 |
1 |
a2 |
1 |
a |
(a+
1 |
a |
1 |
a2 |
1 |
a |
1 |
a |
(a+
1 |
a |
1 |
a2 |
1 |
a |
∴(a+
1 |
a |
1 |
a |
1 |
a |
∴(a+
1 |
a |
1 |
a |
1 |
a |
而a+
1 |
a |
∴a+
1 |
a |
1 |
a |
∴a+
1 |
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