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已知:,则(-x)y=________.
已知:,则(-x)y=________.
发布时间:2020-08-07 09:28:09
已知:,则(-x)y=________.
网友回答
-
解析分析
:根据二次根式为非负数,列不等式组可得x的值,进而得到y的值,代入求值即可.
解答:
由题意得,
解得x=,
∴y=3,
∴(-x)y=(-)3=-.
点评:
两个互为相反数的数为二次根式的被开方数,则被开方数为0.
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