已知x为实数,且x
2+
=3,则x
3+
的值是 ___ .
人气:335 ℃ 时间:2020-06-02 22:54:22
解答
∵x
2+
=
(x+)2-2=3,
故
+x=±
,
又∵x
3+
=(x+
)(x
2-1+
)=±
×2
=±2
.
故答案为:±2
.
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