3x-y+2z=8 2x+2y-4z=9 7x+y-5z=-4解方程组

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3x-y+2z=82x+2y-4z=97x+y-5z=-4解方程组3x-y+2z=82x+2y-4z=97x+y-5z=-4解方程组3x-y+2z=82x+2y-4z=97x+y-5z=-4解方程组1

3x-y+2z=8 2x+2y-4z=9 7x+y-5z=-4解方程组
3x-y+2z=8 2x+2y-4z=9 7x+y-5z=-4解方程组

3x-y+2z=8 2x+2y-4z=9 7x+y-5z=-4解方程组
1.)x-2y+3z=4
2.)2x+y+4z=9
3.)3x-2y-z=-4
方程3-方程1,得:x-2z=-4,x=2z-4
将x=2z-4 代入方程2和方程3中,得：
8z+y=17
5z-2y=8
解上述两个方程,可得
z=2,y=1
由此可得：x=2z-4=2*2-4=0
由此可解出：
x=0；y=1；z=2

已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? x+2y=3x+2z=4y+z 求x:y:z x+y/2=z+x/3=y+z/4 x+y+z=27 (x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊试证明(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=5 2x+3y-z=9 x-y+z=4 解下列三元一次方程组:(1)x-z=4,x+y-z=-1,2y-z=1 (2)3x+4z=7,2x+3y+z=9,x-y+z=8 三元一次方程x+y+z=0 4x+2y+z=3 9x+3y+z=6x+y+z=04x+2y+z=3 9x+3y+z=6 2x+z=10 x+y-z=4 3x-y-z=0 解方程 x+y+z=0 4x+2y+z=3 9x-3y+z=28解方程x+y+z=04x+2y+z=39x-3y+z=28 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 2x+y-z=2 x-y+2z=2 3x+2y+4z=9 2x+y-z=2 x-y+2z=2 3x+2y+4z=9 x:y:z=3:4:5 2x-3y+2z=8 x-y-2z=?