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描出A(-2,0),D(4,0)两点,它们在 轴上,你发现了什么?总结:x轴上点的坐标特点:纵坐标为 ;B(0,-3),F(0,3)在 轴上.总结:y轴上点的坐标特点:横坐标为 .坐...
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教案备课库《平面直角坐标系(一)课堂练习》真题及答案
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如图在平面直角坐标系中已知AB两点的坐标分别为4003点C是OB上一点把△ABC沿直线AC折叠使点B
B两点的坐标分别为(4,0).(0,3),点C是OB上一点,把△ABC沿直线AC折叠,使点B刚好落在x轴上的D点处,则点D的坐标是( )
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已知点A.-20B.40C.-2-3.1求A.B.两点之间的距离.2求点C.到X.轴的距离.3求△A
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如图所示在直角坐标系中
点坐标为(-3,-2),⊙A.的半径为1,P.为x轴上一动点,PQ切⊙A.于点Q.,则当PQ最小时,P.点的坐标为( ) A.(-4,0)
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若二次函数y=ax2+bx+c的图象与x轴交于A.-20B.40两点且函数的最大值为9则这个二次函数
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如图二次函数y=ax2+bx+c的图象与x轴交于﹣20和40两点当函数值y>0时自变量x的取值范围是
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