不等式1/(x-y)+1/(y-z)y>z,且1/(x-y)+1/(y-z)
①(x+y+z)(-x+y+z)(x-y+z)(x+y-z)
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.
代数不等式(1)设x,y,z为正实数求证 3(x^3*y+y^3*z+z^3*x)=
已知 x,y,z都是正实数,且 x+y+z=xyz 证明 (y+x)/z+(y+z)/x+(z+x)/y≥2(1/x+1
已知有理数x,y,z,且|x-3|+2|y+1|+7(2z+1)2=0,求x+y+z的相反数的倒数.
已知有理数x,y,z,且|x-3|+2|y+1|+(2z+1)²=0,求x+y+z的相反数的倒数.
(1)X,Y,Z均为整数,且11|7X+2Y-5Z,求证11|3X-7Y+12Z
若x,y,z均为实数,且(x-1)²+|y+2|+根号(z-3)²=0则x,y,z的值分别为?
已知3x=4Y,5Y=6Z,求 (1)x:y:z;(2)x+y/y+z.
已知x ,y ,z都是正数且满足xyz(x+y+z)=1试求(x+y)(y+z)取得最小值时x,y,z的值各是多少?
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)
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