若x,y,z成等差数列,则(Z-X)^2-4(X-Y)(Y-Z)等于
1.设X ,Y,Z 成等差数列,代数式(X-Z)*(X-Z)+ 4(X-Y)(Z-Y)=
(x-y+z)(x+y+z)等于多少.
已知x+y=3,y+z=4,x+z=5,则x+y+z等于( )
①(x+y+z)(-x+y+z)(x-y+z)(x+y-z)
已知整数x,y,z成等差数列,x+y,y+z,z+x成等比数列,且x+y+z∈(40,45),求此三个数
若3x+5y+6z=5,4x+2y+z=2,则x+y+z的值等于( )
若2x+5y+4z=0,3x+y-7z=0,则x+y-z的值等于( )
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分之y+z=y分之z+x=z分之x+y(x+y+z不等于0),求x+y+z分之x+y-z
x,y,z为正实数 x/(2x+y+z)+y/(x+2y+z)+z/(x+y+2z)
已知三个实数x,y,z满足条件(z-x)^2-4(x-y)(y-z)=0,求证:x,y,z成等差数列
非零实数x,y,z成等差数列,x+1,y,z与x,y,x+z都成等比数列,则y等于