若x/3=y/4=z/5则x+y/x-2y+3z=?
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若x/3=y/4=z/5则x+y/x-2y+3z=?若x/3=y/4=z/5则x+y/x-2y+3z=?若x/3=y/4=z/5则x+y/x-2y+3z=?设x/3=y/4=z/5=k(k≠0)则x=
若x/3=y/4=z/5则x+y/x-2y+3z=?
若x/3=y/4=z/5则x+y/x-2y+3z=?
若x/3=y/4=z/5则x+y/x-2y+3z=?
设x/3=y/4=z/5=k(k≠0)
则x=3k,y=4k,z=5k,代入(x+y)/(x-2y+3z),得
(x+y)/(x-2y+3z)=(3k+4k)/(3k-2×4k+3×5k)=7k/10k=7/10
若x/2=y/3=z/4,则3x-2y+5z/x+y+z=
若x/2=y/3=z/4则3x-2y+5z/x+y+x=
若x+y+z=3y=2z,则x/x+y+z=?
若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)=
若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)=
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
若x/4=y/4=z/5,则x+y/x-2y+3z=
若x/3=y/4=z/5则x+y/x-2y+3z=?
若2x+5y+4z=0 ,3x+y=0;则x+y-z=?
已知:4x-5y+2z=0 x+4y-3z=0则:(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.
三元一次方程组题目x+y-z=11 y+z-x=5 x-y+z=1x+y=4 y+z=3 x+z=5若已知x-3y+2z=0 2x+3y-8z=0, 且xyz≠0,则x:y:z=
若x/2=y/3=z/4,则x+y+z/x=多少?
若3x+7y+z=5,4x+10y+z=3,则x+y+z=?
若x/3=y/2=z/5,则2x-3y-z/x-y+z=
已知(x+2y)/3=(y+3z)/4=(z+5x)/5,则x:y:z=
已知x+2y/3=y+3z/4=z+5x/5,则x:y:z=?
已知x+2y/3=y+3z/4=z+5x/5,则x:y:z=
若2x=3y=5z,则3x-2y+z/x+y-z