题目内容
已知x满足x+
=3
,则x2+
的值为______.
1 |
x |
6 |
1 |
x2 |
∵x+
=3
,
∴两边平方得:(x+
)2=(3
)2,
x2+2+
=54,
∴x2+
=52,
故答案为:52.
1 |
x |
6 |
∴两边平方得:(x+
1 |
x |
6 |
x2+2+
1 |
x2 |
∴x2+
1 |
x2 |
故答案为:52.
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1 |
x |
6 |
1 |
x2 |
1 |
x |
6 |
1 |
x |
6 |
1 |
x2 |
1 |
x2 |