200分x+y-z=-14x-3y+2x=162x-2y-3z=5 求z值等于多少,
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200分求数学题,急x+y-z=-14x-3y+2z=162x-2y-3z=5求z等于多少
200分x+y-z=-14x-3y+2x=162x-2y-3z=5 求z值等于多少,
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
x+y+z=6 x+2y+3z=14 y+1=z
证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
14x+4y+z=200,x+y+z=100求解x,y,z
x+y+z=14 7z=x+y+2 x+z=y
x/2=y/3=z/5 x+3y-z/x-3y+z
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
若x+y+z=3y=2z,则x/x+y+z=?
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
(1)X+Y=15,Y+Z=-6,Z+X=7.(2)X+Y=-14,Y+Z=-7,Z+X=9.(3)X+Y=0,Y+Z=-1,Z+X=-1.
3x+2y+z=14 x+y+2z+-3 2x+3y-z=1
x+2y+3z=14 2x+y+z=7 3x+y+2z=11
2x+y+3z=14 x-y+z=4 3x-y-z=2
[3x+2y+z=14,x+y+z=10,2x+3y-z=1]