y=2x-7 5x+3y+2z=2 3x-4z=4 （解三元一次方程组）y=2x-7 5x+3y+2z=2 3x-4z=4

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y=2x-7 5x+3y+2z=2 3x-4z=4 （解三元一次方程组）y=2x-7 5x+3y+2z=2 3x-4z=4
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y=2x-7 5x+3y+2z=2 3x-4z=4 （解三元一次方程组）y=2x-7 5x+3y+2z=2 3x-4z=4
y=2x-7 5x+3y+2z=2 3x-4z=4 （解三元一次方程组）
y=2x-7 5x+3y+2z=2 3x-4z=4

y=2x-7 5x+3y+2z=2 3x-4z=4 （解三元一次方程组）y=2x-7 5x+3y+2z=2 3x-4z=4
y=2x-7 ①
5x+3y+2z=2 ②
3x-4z=4 ③
②×2：
10x+6y+4z=4 ④
③+④：
13x+6y=8 ⑤
把①代入⑤得：
13x+6(2x-7)=8
13x+12x-42=8
25x=50
∴x=2
代入①得：y=-3
代入③得：z=0.5
综上所述,解为：x=2,y=-3,z=0.5

5X+3(2X-7)+2Z=2 X=4Z+4/3
5*(4Z+4/3)+3*(2*(4+4Z/3)-7)+2Z=2
Z=0.5 x=2 y=-3

x/2=y/3=z/5 x+3y-z/x-3y+z 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 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z) x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2 {5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=-1 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian x/5=y/3 x/7=z/3 2x-y-z=34 3x-y=-7,y+2z=2,2x-2z=-5 求x,y,z x+y+z=0,3x-2y-2z=5,y-z=2x-7 1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38 X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? 3x+7y+4z=35,x+5y+2z=40,x+y+z=( ) {x+y+z=1 {x+3y+7z=-1 {x+5y+8z=2 {x+y+z=1 {x+3y+7z=2 {x+5y+19z=4