填空题 4..5(x-y+z)(-x+y+z)[z+(____)][_ __ __ _]=z^2-(____)^2,5,
若整数x、y、z满足(9/8)^x×(9/10)^y×(16/15)^z=2 ,则x=____ y=____ z=___
x:y=2:3,y:z=4:5则3x+y-z=42,x=_.y=_z=_
x/2=y/3=z/5 x+3y-z/x-3y+z
已知x+y-7z=0 x-2y+5z=0(xyz不等于0),求x+2y-z/y-2x+12z
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/(除以)x-y+z的值.
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.
1.已知x:y:z=4:5:7,求:(一)2x+3y+z/5z; (二)x+y/y+z 非常急,
已知x、y、z是三个非负整数,满足3x+2y+z=5,x+y-z=2,若s=2x+y-z,则s的最大值与最小值的和为 _
thank you已知x+3y+5z=0,2x+3y+z=0 且x、y、z.都不是0,则(2y-z)(2y+z)除以z的
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*
若x-y+4z=0,x+2y+3z=0.则(3x+2y-z)/(2x-3y+z)=____.
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2