20(x+y)=12(y+z)=15(z+x),且xyz不等于零,求x:y:z=
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20(x+y)=12(y+z)=15(z+x),且xyz不等于零,求x:y:z=
(x+y-z)(x-y+z)=
解方程 x(x+y+z)=6 y(x+y+z)=12 z(x+y+z)=18
解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18
X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)
x+y=8 y+z=12 x+z=10 x+y+z=
x+y=8 y+z=12 x+z=10 x+y+z=
已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=?
x+y+z=15 x+5y+10z=70 x,y,z,各是几?
x+y+z=15 x+5y+10z=70 x,y,z,各是几?
X+Y-Z=15 X+5Y+10Z=70 求:X、Y、Z
(y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值
x+y=10 y+z=15 z+x=20 求x,y,z等于多少?
x+y=12 y+z=20 z+x=18 求X Y Z分别等于几?
X+Y+Z=15 X+5Y+10Z=70,Y.Z的值
请高手帮我解几道3元1次的方程组!好的100分,x+2y+3z=15x-y+7z=20x+3y+2z=14x+y-z=3y+z-x=5z+x-y=7x+y-z=0.5x-3y+2z=03x+2y-z=23x-2y=12y+3z=2x+5z=315x-3y+2z=13x+4y-z=-18z=136x-y-z=32x-4y+8z=53x-6y-z=10x+y=3y+z=5x+z=6
x+y+z=12 x-y+z=2 x-z+y+a=90 x+y+a+z=100,求x y z a