1:圆(x-1)^2+(y-2)^2=1,关于直线y=x对称的圆的方程是(x-2)^2+(y-1)^2=12:直线2x-y+c=0与圆x^2+y^2=9相切,则C=?正负3√5
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 17:18:23
![1:圆(x-1)^2+(y-2)^2=1,关于直线y=x对称的圆的方程是(x-2)^2+(y-1)^2=12:直线2x-y+c=0与圆x^2+y^2=9相切,则C=?正负3√5](/uploads/image/z/2832077-29-7.jpg?t=1%EF%BC%9A%E5%9C%86%28x-1%29%5E2%2B%28y-2%29%5E2%3D1%2C%E5%85%B3%E4%BA%8E%E7%9B%B4%E7%BA%BFy%3Dx%E5%AF%B9%E7%A7%B0%E7%9A%84%E5%9C%86%E7%9A%84%E6%96%B9%E7%A8%8B%E6%98%AF%28x-2%29%5E2%2B%28y-1%29%5E2%3D12%EF%BC%9A%E7%9B%B4%E7%BA%BF2x-y%2Bc%3D0%E4%B8%8E%E5%9C%86x%5E2%2By%5E2%3D9%E7%9B%B8%E5%88%87%2C%E5%88%99C%3D%3F%E6%AD%A3%E8%B4%9F3%E2%88%9A5)
1:圆(x-1)^2+(y-2)^2=1,关于直线y=x对称的圆的方程是(x-2)^2+(y-1)^2=12:直线2x-y+c=0与圆x^2+y^2=9相切,则C=?正负3√5
1:圆(x-1)^2+(y-2)^2=1,关于直线y=x对称的圆的方程是
(x-2)^2+(y-1)^2=1
2:直线2x-y+c=0与圆x^2+y^2=9相切,则C=?
正负3√5
1:圆(x-1)^2+(y-2)^2=1,关于直线y=x对称的圆的方程是(x-2)^2+(y-1)^2=12:直线2x-y+c=0与圆x^2+y^2=9相切,则C=?正负3√5
1、
圆心(1,2)
他关于y=x的对称点是(2,1)
这就是圆心,半径不变
所以是(x-2)^2+(y-1)^2=1
2、
圆心(0,0)到切线距离等于半径r=3
所以|0-0+c|/√(2²+1²)=3
|c|=3√5
所以c=±3√5
2y(x+二分之一y)-[(x+y)(x-y)+2y(y+x)],其中|x-1|=2
(x-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3.
已知x+y=a,2x-y=-2a,求[(x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
x+2y=2x+y+1=7x-y 求:2x-y?
设x,y满足约束条件x+y>=1,x-y>=-1,2x-y
设x,y满足约束条件x+y>=1,x-y>=-1,2x-y
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y
(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
若x*x+y*y=x+y-1/2,求x,y的值如题
先化简,再求值:y(x-y)-x(x+y)/x²-y²÷x²+y²/x+y,其中x=2,y=-1