求曲面x^2+y^2+z^2-3x=0,2x-3y+5z-4=0在点(1，1，1)

求曲面e^z-z+ln(x+y)=1在点(-1,2,0)处的切平面方程.求曲面e^z-z+ln(x+y)=1在点(-1,2,0)处的切平面方程.求曲面e^z-z+ln(x+y)=1在点(-1,2,0)

若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值若|x+3|+|y-2|+|2×z+

1.求曲线x^2+y^2+z^2=6,x+y+z=0在点(1,-2,1)处的切线和法平面2.求曲面z=2x^2+4y^2上点（2,1,12）处的切平面和法线3.在曲面z=xy上求一点,是该点处的法线垂

曲面z=x+y^2在(1,0,1)点的法向量为?急曲面z=x+y^2在(1,0,1)点的法向量为?急曲面z=x+y^2在(1,0,1)点的法向量为?急两节课更符合规范和规范化和

直线x+y+b=0x+ay-z-3=0在平面1上,平面与曲面z=x^2+y^2相切于点（1,-2,5）求a,b的值直线x+y+b=0x+ay-z-3=0在平面1上,平面与曲面z=x^2+y^2相切于点

求平面x+y+z=2与曲面x^2-2y^2+2z^2=1(x,y,z>0)之间的最短距离求平面x+y+z=2与曲面x^2-2y^2+2z^2=1(x,y,z>0)之间的最短距离求平面x+y+z=2与曲

已知4x-3y-3z=x-3y+z=0(x、y、z不等于0)(1)求x：y：z（2）求2x+3y-4z/z的值已知4x-3y-3z=x-3y+z=0(x、y、z不等于0)(1)求x：y：z（2）求2x

在曲面Z=√(2+X^2+4Y^2)上求一点使它到平面X-2Y+3Z=1的距离最近在曲面Z=√(2+X^2+4Y^2)上求一点使它到平面X-2Y+3Z=1的距离最近在曲面Z=√(2+X^2+4Y^2)

直线L{x+y+b=0,x+ay-z-3=0}在平面π上,平面π与曲面z=x^2+y^2相切于点(1,-2.5),求a,b直线L{x+y+b=0,x+ay-z-3=0}在平面π上,平面π与曲面z=x^

1.{x:y:z=3:4:52x+3y-5z=-142.{x-y-z=-13x+5y+7z=114x-y+2z=-13.{x+y=1x+z=02x+y+2z=44.{x-y+z=-32x-y-z=-2

求曲面3xy^2-x^2y-z-e^(2x)=0在点(1,1,1)的切平面方程求曲面3xy^2-x^2y-z-e^(2x)=0在点(1,1,1)的切平面方程求曲面3xy^2-x^2y-z-e^(2x)

已知（1）X-Y+Z=0(2)X+2Y-3Z=0求X:Y:Z已知（1）X-Y+Z=0(2)X+2Y-3Z=0求X:Y:Z已知（1）X-Y+Z=0(2)X+2Y-3Z=0求X:Y:Z（1）-（2）：4Z

解方程组2x+y-3z=1,x-2y+z=6,3x-y+2z=9求x,y,z的值解方程组6x+y-z=0,3x-y+z=5,y+2z=4求x,y,z的值真的实在解不出来,希望你能帮帮忙!解方程组2x+

已知4x-3y-3z=0,x-3y-z=0求(1)x:z的值.（2）x:y:z的值.已知4x-3y-3z=0,x-3y-z=0求(1)x:z的值.（2）x:y:z的值.已知4x-3y-3z=0,x-3

已知｛2x-y-z=0,3x-9y+z=0求1,x:y:z已知｛2x-y-z=0,3x-9y+z=0求1,x:y:z已知｛2x-y-z=0,3x-9y+z=0求1,x:y:z2x-y=z3x-9y=-

若实数XYZ满足2|x-y|+√2y+z+z方-z+1//4=0求X+Y+Z2y+z在根号里若实数XYZ满足2|x-y|+√2y+z+z方-z+1//4=0求X+Y+Z2y+z在根号里若实数XYZ满足

x+2y-z=-5x+y+2z=-13x+4y-2z=-12x+2y-z=32x+y+3z=04x+z=-4x+2y-z=-5x+y+2z=-13x+4y-2z=-12x+2y-z=32x+y+3z=

已知x:：y：z=3：4：5,(1)求x+y分之z的值；（2）若x+y+z=6,求x,y,z.已知x:：y：z=3：4：5,(1)求x+y分之z的值；（2）若x+y+z=6,求x,y,z.已知x:：y

已知实数xyz满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值已知实数xyz满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z

已知实数xyz满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值已知实数xyz满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z