解方程组3x+4y+z=14 x+5y+2z=17 2x+2y-z=3
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/30 12:44:13
解方程组3x+4y+z=14 x+5y+2z=17 2x+2y-z=3
![解方程组3x+4y+z=14 x+5y+2z=17 2x+2y-z=3](/uploads/image/z/85862-38-2.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%843x%2B4y%2Bz%3D14+x%2B5y%2B2z%3D17+2x%2B2y-z%3D3)
3x+4y+z=14 ①
x+5y+2z=17 ②
2x+2y-z=3 ③
①+③得:
5x+6y=17 ④
③× 2+② 得:
5x+9y=23 ⑤
⑤-④ 得:
3y=6 y=2
将y=2代入④ 解得:x=1
将x=1,y=2代入①得:z=3
x+5y+2z=17 ②
2x+2y-z=3 ③
①+③得:
5x+6y=17 ④
③× 2+② 得:
5x+9y=23 ⑤
⑤-④ 得:
3y=6 y=2
将y=2代入④ 解得:x=1
将x=1,y=2代入①得:z=3
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
方程组3x+4y+z=14 x+5y+2z=17 2x+2y-z=3 解方程组
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.
x+y/2=z+x/3+y=z/4,...x+y+z=27.解方程组.
已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z
解方程组3x+4y+z=14 x+5y+2z=17 2x+2y-z=3
解三元一次方程组:x+y+z=6,y-z=4,x-y-2z=3,
解方程组:{x/2=y/3=z/4 2x+y+z=22
x:y:z=2:3:5解方程组 2x+3y-z=16