9的相反数是 .
考点分析:
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C.
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D.
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如图,小球从点A运动到点B,速度v(米/秒)和时间t(秒)的函数关系式是v=2t.如果小球运动到点B时的速度为6米/秒,小球从点A到点B的时间是( )
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C.π
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当实数x的取值使得
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D.
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