首先,Happy newyear 兔 everyone,

来源：学生作业帮编辑：作业帮分类：综合作业时间：2024/05/28 12:38:41

首先,Happy newyear 兔 everyone,
1.求圆心在直线2x-y-3上,且经过点(5,2) 和点(3,-2) 的圆的标准方程
2 过圆x²+y²=4一点M(4,-1)引圆的两条切线,求经过两切点的直线方程.（要求同上）
请问一楼怎样与圆方程联立△？x²，y²啊……二元二次咋搞△

1.设圆心坐标（m,n)因为圆心在直线2x-y-3上,所以圆心坐标为（m,2m-3)
所以圆的方程为（x-m）^2+(y-2m+3)^2=r^2
把（5,2）（3,-2）两点带入求出m与r^2的值
2.设直线方程为y=kx+b把点M（4,-1）代入-1=4k+b所以b=-1-4K所以kx-y-4k-1=0
因为相切圆心（0,0）到直线距离为半径2
|-4k-1|/√(k^2+1)=2解出k 得出方程

HAPPY NEWYEAR是什么意思 happy newyear!翻译中文 Merry Christmas and a happy newyear ·happy newyear happybirtyday我都要你出现 Merry Christmas and a happy newyear.这语法有错吗? l'm happy and you are very happy.we are happy.the newyear is Everyone is happy 还是Everyone are happy? happy new year everyone. wish everyone happy? Happy festival to everyone everyone is happy反义疑问句 I hope everyone happy about me"