化简计算 (4y+3x-5z)(3x-4y+5z)
化简计算 (4y+3x-5z)(3x-4y+5z)
已知3X=4X,5Y=6Z求X+Y:Y+Z
计算:3x-2y- [-4x+(z+3y)]
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
已知x:y:z=3:4:5,3x+2y-4z=18.求:x+y+z.
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
x/3=y/4=z/5,求x+y+z/3x-2y+z的值,
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
3x+7y+z=5 ,4x+10y+z=6 ,x+y+z=