求2y^2=x z=0 x/4+y/2+z/2=1所围成的体积,请问各位大侠们,这个题目用二重积分做还是三重积分做,哪个简求2y^2=x z=0 x/4+y/2+z/2=1所围成的体积,请问各位大侠们,这个题目用二重积分做还是三重积分做,

已知：x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值. x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值 x+2y=3x+2z=4y+z 求x:y:z (x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z 2|X-Y|+√2Y+Z+Z²-Z+1/4=0求X+Y+Z的值 已知x、y、z满足方程组：x+y-z=6；y+z-x=2；z+x-y=0 求x、y、z的值 已知X.Y.Z满足方程组,X+y-Z=6y+z-x=2z+x-y=0求X.Y.Z的值 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, x^2+y^2+z^2+4x+4y+4z+1=0,求x+y+z x^2+y^2+z^2+4x+4y+4z+1=0求x+y+z x^2+y^2+z^2+4x+4y+4z+1=0 求x+y+z 已知{x-5y+2z=0 3x-5y-4z=0,求x：y:z 若(z-x)2-4(x-y)(y-z)=0,求x+z-2y+2009如题 若x/2=y/3=z/4不等于0,求x+y+z/x+y-z的值 若(x-z)^2-4(x-y)(y-z)=0,求x+z与y的关系 已知(z-x)∧2-4(x-y)(y-x)=0求x+z-2y+8的值写错了(z-x)∧2-4(x-y)(y-z)=0求x+z-2y+8 已知整数x、y、z,满足x≤y＜z,且｜x+y｜+｜y+z｜+｜z+x｜=4,｜x-y｜+｜y-z｜+｜z-x｜=2,求x^2+y^2+z^2的值.