若y:x:z等于5:3:8,且7x+3y-5z等于8,则x,y,z各等于多少?
若y:x:z等于5:3:8,且7x+3y-5z等于8,则x,y,z各等于多少?
如果x/2=y/7=z/5,x,y,z都不等于0,则(x+y+z)/(3x-y)等于多少?
X+Y+Z=200,1/3X+4Y+5Z=200,求X,Y,Z等于多少?
2x等于5y,2z等于3y求3x等于几z
若 x/2等于y/3等于z/4,且x+y-z=5 求xyz的值
若三分之x等于四分之y等于5分之z且x+2y+3z=52,求x+y+z=_____
已知x+y=3,y+z=4,x+z=5,则x+y+z等于( )
若2x+5y+4z=6,3x+y-7y=-4,则x+y-z等于多少
方程组{2x+5y+3z=0,3x+5y-8z=0.这不等于0,x:z和y:z是多少?
若2x+5y+4z=0,3x+y-7z=0,则x+y-z的值等于( )
若x比y比Z=2比5比7 则 2x+2y+z分之3x+4y-2z等于?
(x-y+z)(x+y+z)等于多少.