1、(x+y)^2 2、(x+2y)^2 3、(-2x+3)^2 4、(-xy^2z^3)^2
已知x/2=y/3=z/4,求下列各式 (1)(x+y+z)/x (2)(x-y+2x/(x-y-2z)
已知{X-3Y+7z=0,x-2y+4Z (xy不等于0).求X:Y:Z
已知实数x、y、z满足(x²-6xy+10y²+4y)y²+4y+|(z-3/2)
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.
x+y=-10,xy方=-81,求3[-(x+y)+2xy方-z]-2[(x+y)-xy方+z]-5[-3(x+y)-z
求证不等式 x,y,z >0求证27*(x+y)^2*(y+z)^2*(z+x)^2大于等于64(xy+yz+xz)^3
初中的计算题 帮个忙3(y-z)^2-(2y+z)(-z+2y)[x(x^2y^2-xy)-y(x^-x^3y)]/3x
计算:3xy[2xy-x(y-2)+x]
已知4X-3Y-6Z=0,X+2Y-7Z=0,(XY不等于0),求代数式5X^2+1Y^2-Z^2/2X^2-3Y^2-
已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z都不为0,求(3x*x+y*y+4z*z)/(5x*x+y*
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)