1.X+Y+Z=6X+2Y+3Z=12182.X+Y=2572X×2=96Y3.X+Y=682X+4Y=208

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1.X+Y+Z=6
X+2Y+3Z=1218
2.X+Y=25
72X×2=96Y
3.X+Y=68
2X+4Y=208

第1题可能有问题
2.X=25-Y
代入,72(25-Y)*2=96Y
3600-144Y=96Y
240Y=3600
Y=15
把Y=15代入X=25-Y,
X=5
3.X=68-Y
代入,2(68-Y)+4Y=208
136+2Y=208
2Y=208-136
2Y=72
Y=36
把Y=36代入X=68-Y
X=32

试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) (x+y-z)(x-y+z)= 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai 1.x+y=16,y+z=12,z+x=102.3x-y+z=4,2x+3y-z=12,x+y+z=63.x+y+z=6 x/2=y/3=z/5 x+3y-z/x-3y+z X+Y+Z=? f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w) x,y,z为实数且(y-z)^2+(x-y)^2+(z-x)^2=(y+z-2x)^2+(x+z-2y)^2+(x+y x,y,z为实数且(y-z)平方+(x-y)平方+(z-x)平方=(y+z-2x)平方+(z+x-2y)平方+(x+y- (x+y-z)^2-(x-y+z)^2=? ①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-