2x-y+2z=-17 3x+y-3z=-4 x+y+z=6
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/19 16:07:57
2x-y+2z=-173x+y-3z=-4x+y+z=62x-y+2z=-173x+y-3z=-4x+y+z=62x-y+2z=-173x+y-3z=-4x+y+z=62x-y+2z=-17①3x+y
2x-y+2z=-17 3x+y-3z=-4 x+y+z=6
2x-y+2z=-17 3x+y-3z=-4 x+y+z=6
2x-y+2z=-17 3x+y-3z=-4 x+y+z=6
2x-y+2z=-17 ①
3x+y-3z=-4 ②
x+y+z=6 ③
③*2:2x+2y+2z=12④
④-①:3y=29
y=29/3
带入③:x+z=-11/3⑤
带入②:3x-3z=-41/3 即x-z=-41/9⑥
⑤+⑥:2x=-74/9
x=-37/9
z=4/9
所以
x=-37/9
y=29/3
z=4/9
很高兴为您解答,【学习宝典】团队为您答题.
如追加其它问题,
如果有其他需要帮助的题目,您可以求助我.
(1)2x-y+2z=-17
(2)3x+y-3z=-4
(3)x+y+z=6
(1)+(2):5x-z=-21记为(4)
(2)-(3):2x-4z=-10记为(5)
4*(4)得20x-4z=-84记为(6)
(6)-(5):18x=-74,x=-37/9, z=4/9, y=87/9
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
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
方程组x+3y-z=17 2x-y+z=16中的y、z同时满足y=z+2,求x、y、z.急!
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=?
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
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
x+y+z=6 x+2y+3z=14 y+1=z
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z
X=3z X+y+z=12 X+2y-2z=10
2x+z=10 x+y-z=4 3x-y-z=0
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,
2x-y+2z=-17 3x+y-3z=-4 x+y+z=6