已知:x3+y3-z3=96 xyz=4 x2+y2+z2-xy+yz+xz=12 求x+y-z
已知x3+y3-z3=96,xyz=4,x2+y2+z2-xy+xz+yz=12,则x+y-z=( )
已知x+y+z=1,x2+y2+z2=2,x3+y3+z3=3,求xy(x+y)+yz(y+z)+zx(z+x)的值
已知x+y+z=3,x2+y2+z2=19,x3+y3+z3=30则xyz=?
已知x+y+z=2,x2+y2+z2=12则x3+y3+z3=
已知x,y,z都是正整数,并且x3-y3-z3=3xyz,x2=2(y-z),求xy+yz+zx
已知x2 + y2 + z2 = xy + xz + yz = 3 求x+y+z
已知;x/3=y/4=z/6 求;(xy+yz+xz)/(X2+y2+z2)
已知xyz=1.x2+y2+z2=16.求1/xy+2z+1/yz+2x+1/xz+2y的值
因式分解X2(Y+Z)+Y2(Z+X)+Z2(X+Y)-(X3+Y3+Z3)-2XYZ
已知x-y=5,y-z=2,求x2+y2+z2-xy-yz-xz的值
已知x-y=5,y-z=3,求x2+y2+z2-xy-yz-xz的值
已知x+y+z=2,xy+yz+xz=-5,求x2+y2+z2的值.