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过点A(a,a)可作圆x2+y2-2ax+a2+2a﹣3=0的两条切线,则实数a的取值范围为( )
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高二上学期数学《高二数学学科周六作业(2017-2018学年下学期)作业序号:2》真题及答案
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2
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若点P.在直线l1x+y+3=0上过点P.的直线l2与曲线C.x-52+y2=16相切于点M.则|P
若过点
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2
+y
2
-2ax+a
2
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(-∞,-3)∪
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过两圆x2+y2-x-y-2=0与x2+y2+4x-4y-8=0的交点和点31的圆的方程是_____
过点21的直线中被圆x2+y2-2x+4y=0截得的弦为最短的直线的方程为
3x-y-5=0
x+3y-5=0
3x-y-1=0
x+3y-1=0
过点21的直线中被圆x2+y2-2x+4y=0截得的弦最长的直线的方程是
3x-y-5=0
3x+y-7=0
3x-y-1=0
3x+y-5=0
关于一次函数y=﹣2x+3下列结论正确的是
图象过点(1,﹣1)
图象经过一、二、三象限
y随x的增大而增大
当x>
时,y<0
如图以过原点的直线的倾斜角θ为参数求圆x2+y2-x=0的参数方程.
已知圆C.x2+y2+4x﹣6y﹣3=0.1求过点M.﹣6﹣5的圆C.的切线方程2过点N.13作直线
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过点A2-3B-2-5圆心在直线x-2y-3=0上的圆的方程是
设p>0是一常数过点Q2p0的直线与抛物线y2=2px交于相异两点AB以线段AB为直径作圆HH为圆
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