He lay in bed, his eyes _____ up at the ceiling and his fingers _____. [ ]A. looked, crossing B. loo

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• 在－1、3、－2这三个数中，任选两个数的积作为k的值，使反比例函数的图象在第一、三象限的概率是．-七年级数学
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• 如图，已知直线y=mx与双曲线的一个交点坐标为（3，4），则它们的另一个交点坐标是A．（﹣3，4）B．（﹣4，﹣3）C．（﹣3，﹣4）D．（4，3）-八年级数学
• 如图，在平面直角坐标系xOy中，△ABC的边AC在x轴上，边BC⊥x轴，双曲线与边BC交于点D（4，m），与边AB交于点E（2，n）．（1）求n关于m的函数关系式；（2）若BD=2，tan∠BAC=，
• 如图，两个反比例函数和在第一象限内的图象分别是C1和C2，设点P在C1上，PA⊥x轴于点A，交C2于点B，则△POB的面积为．-八年级数学
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• 如图，是反比例函数的图象的一个分支，对于下列说法：①常数的取值范围是；②图象的另一个分支在第四象限；③在函数图象上取点和，当时，则；④在函数图象的某一个分支上取点和点-八年级数学
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• 若点A（1，y1）、B（2，y2）都在反比例函数的图象上，则y1、y2的大小关系为A．y1＜y2B．y1≤y2C．y1＞y2D．y1≥y2-八年级数学