共50条信息
已知圆\(C\)经过\(A\left(-2,1\right),B\left(5,0\right) \), 两点,且圆心\(C\)在直线\(y=2x\)上\(.\)
\((1)\)求圆\(C\)的方程;
\((2)\)动直线\(l\):\(\left( m+2 \right)x+\left( 2m+1 \right)y-7m-8=0\)过定点\(M\),斜率为\(1\)的直线\(m\)过点\(M\),直线\(m\)和圆\(C\)相交于\(P\),\(Q\)两点,求\(PQ\)的长度.
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