共50条信息
已知直线\(ax+y+a+1=0 \),不论\(a\)取何值,该直线恒过的定点是( )
已知点\(A(1,3)\),\(B(-2,-1)\),若直接\(l:y=k(x-2)+1\)与线段\(AB\)相交,则\(k\)的取值范围是\((\) \()\)
已知\(\{a_{n}\}\)为等差数列,前\(n\)项和为\(S_{n}\),点\((n,a_{n})\)都落在直线\(y=kx+4-5k\)上那么\(S_{9}=\)
己知曲线\(C_{1}︰y_{2}=tx(y > 0,t > 0)\)在点\(M(\dfrac{4}{t},2)\)处的切线与曲线\(C_{2}︰y=e^{x+1}-1\)也相切,则\(t\ln \dfrac{4{{e}^{2}}}{t}\)的值为\((\) \()\)
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