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已知向量a=12b=-23若ka+b与a-kb垂直则实数k的值等于．
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1或－5
其他值
已知a和b互为相反数x的绝对值为1则a+b+x的值等于
已知双曲线经过点-21则k的值等于—
已知向量a=12b=-23若ka+b与a-kb垂直则实数k的值等于.
已知fx＝xa若f′－1＝－4则a的值等于
4
－4
5
－5
已知分式的值等于零则x的值为
1
±1
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已知偶函数fx在[0＋∞上单调递减且flgx＝f1则x的值等于________.
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已知关于x的方程2x﹣3a=﹣1的解为x=﹣1则a的值等于.
已知a=|1﹣b|b的相反数等于1.5则a的值为
2.5
0.5
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