求三平面x+3y+z=1,2x-y-z=0,-x+2y+2z=0的交点是

求三平面x+3y+z=1,2x-y-z=0,-x+2y+2z=0的交点是 求三平面x+3y+z=1,2x-y-z=0,-x+2y+2z=0的交点是 已知三平面：2x+y+z-3=0,x-y+2z-3=0,x+z-3=0,求直截面三角形的面积 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 已知实数x y z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x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=? 求直线2x+2y-z=1 3x+8y+z=6与平面2x+2y-z+6=0的夹角 如果,根号x-3+| y-2 |+z^2=2z-1 求 （x+z)^y x+2y=3x+2z=4y+z 求x:y:z 分式加减的几道题目求速度1 .(x+y)²/（x-z)(y-z) - (y+z)²/（x-z)(y-z) = 2.2x+3y/x-y+2y/y-x-3y/x-y= x:y:z=2:1:5,2x+3y-z=18,求x,y,z,值 已知（1）X-Y+Z=0 (2)X+2Y-3Z=0 求X:Y:Z 已知{x：y：z=1：2：3,x+y+z=12,求x、y、z的值 已知｛2x-y-z=0,3x-9y+z=0求1,x:y:z 已知x:y:z=1:2:3,x+y+z=24,求x,y,z 解方程组:x:y:z=1:2:3;x+y+z=12,求,x,y,z的值