x:y=3:2 y:z=5:4 x+y+z=66解三元一次方程
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x:y=3:2 y:z=5:4 x+y+z=66解三元一次方程
x:y=3:2 y:z=5:4 x+y+z=66解三元一次方程
x:y=3:2 y:z=5:4 x+y+z=66解三元一次方程
x:y=3:2 x=3y/2
y:z=5:4 z=4y/5
3y/2+y+4y/5=66
33y/10=66
y=20
x=30
z=16
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
x+y=5 2x+3y-z=9 x-y+z=4
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
x/2=y/3=z/5 x+3y-z/x-3y+z
x+y/2=z+x/3=y+z/4 x+y+z=27
x+2y=3x+2z=4y+z 求x:y:z
x:y=3:2 y:z=5:4 x+y+z=66
x:y=3:2 y:z=5:4 x+y+z=66
{x:y=2:3 y:z=4:5 x+y+z=35
x:y=2:3 y:z=4:5 x+y+z=35
x+y+z=111,y:x=3:2,y:z=5:4
3x=4y 2y=5z 试求x:y:z
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
已知:4x-5y+2z=0 x+4y-3z=0则:(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)