题目内容
反比例函数
(k>0)与一次函数
(b>0)的图像相交于两点
,线段AB交y轴于点C,当
且AC=2BC时,k、b的值分别为( ).
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A.k=![]() | B.k=![]() | C.k=![]() ![]() | D.k=![]() ![]() |
D
试题分析:首先由AC=2BC,可得出A点的横坐标的绝对值是B点横坐标绝对值的两倍.再由
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∵AC=2BC,
∴A点的横坐标的绝对值是B点横坐标绝对值的两倍.
∵点A、点B都在一次函数
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∴可设B(m,
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∵
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∴m-(-2m)=2,解得
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又∵点A、点B都在反比例函数
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解得
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∴
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故选D.
点评:此题难度稍大,综合性比较强,注意对各个知识点的灵活应用,注意通过解方程组求出k、b的值.
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