若圆2x²+2y²+4ax+8y+a²=0 与Y轴相切 求a
已知x²+y²+4x+2by+b²=0与x轴相切,求b
求两圆X²+Y²+2aX+2aY+2a²-1=0与X²+Y²+2bX+
直线5x+12y+a=0与圆x²-2x+y²=0相切,求a
1.若a²+4b²-2a+4b+2=0,求a、b的值 2.已知x、y满足x²+y²
极坐标中圆(x-1)²+y²=1与直线3x+4y+a=0相切求a
已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值
已知多项式A=x²+2y²-z²,B=-4x²+3y²+2z²
|x+2y+3|+(2x+y)²=0求x²-xy+y²
抛物线y=ax²+c顶点是(0,2)且形状及开口方与抛物线y= -1/2x²相同,求a,c
已知A=4x²-5xy+y²,B=x²+3xy-5y² 求:A-2B的值
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y