先化简后求值 求当x=1,7=2,z=3时,代数式3x^2y-[2x^2-(2xyz-x^2z)-4x^2z]-2xyz
先化简后求值 求当x=1,7=2,z=3时,代数式3x^2y-[2x^2-(2xyz-x^2z)-4x^2z]-2xyz
先化简再求值3xyz+2(x^2y+y^2z-xyz)-xyz+2z^2x x=1 y= -1 z=2
已知xyz满足x+y+z=30,3x+y-z=50,设t=5x+4y+2z 1当t=40时,求xyz的值 2若xyz均为
x:y:z=2:3:4且x+y+z=18求xyz
先化简再求值:xyz-[-x^2y+(xyz-x^2z)]-x^2z,其中x=-1,y=-2,z=1
x*x+y*y+2z*z-2x+4y+4z+7=0,求xyz的值
设X+Y+Z=0求X^3+X^2Z-XYZ+Y^2Z+Y^3的值
方程组X:Y:Z=4:7:8,X+Y+2Z=54 求XYZ
已知xyz不等于0,且2x-y+z=0,x-2y+3z=0,求代数式
方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)
已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
先化简再求值:3x-2y-[2x+2y-(2xyz+x+2z)-4x+2z]-xyz,其中x=-1,y=-2,z=3.