x+y-z=6 ① x-3y+2z=1② 3x+2y-z=3③ 求方程组解.
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x+y-z=6 ① x-3y+2z=1② 3x+2y-z=3③ 求方程组解.
x+y-z=6 ① x-3y+2z=1② 3x+2y-z=3③ 求方程组解.
x+y-z=6 ① x-3y+2z=1② 3x+2y-z=3③ 求方程组解.
本题有两种方法解(望彩纳)
具体解题过程如下:
①—②得4y-3z=5
①*2-③得y-2z=15
将第二个方程*4减第一个方程,得-5z=55 z=-11
将z=-11带入得y=-7 x=2
解三元一次方程组 ①2x-y+z=1 3x+y -2z=2 X+2y-z=3 ②x-4y+z=-3 2x+Y-Z=18 X-Y-Z=7 ③4x+4y+2z=7 6X-4y-z=6 2x-y+z=1
x+y+z=6 x+2y+3z=14 y+1=z
解三元一次方程,①{x+y-z=0{ x+2y+z=13{2x-3y+2z=5②{x+y-z=11{y+z-x=5{z+x-y=1③{x+y=1{y+z=6{z+x=3
已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值
已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值
(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.
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-6=0③x/3=y/2 y/4=z/5 x+y+z=60三元一次方程
x+y-z=6 ① x-3y+2z=1② 3x+2y-z=3③ 求方程组解.
解方程组x+y/2=z+x/3=y+z/4①x+y+z=27②
已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值
已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值
x=2y-9z x+2y-3z=2 x-2y+6z=1
x+y-z=6 x-3y+2z=1 3x+2y-z=4 阿
x+y-z=6,x-3y+2z=1,3x+2y-z=4
x+y-z=6 x-3y+2z=1 3x+2y-z=4
x+y-z=6 x-3y+2z=1 3x+y-z=4