a+b=3 x+y=3 x+y+z=26 b+c=-2 y+z=5 x-y=1 c+a=7 z+x=6 2x-y+z=18 三元一次方程组,3x+z=7 x-y=3 x-y+z=2x+y+2z=7 x+y=5 y+z-x=-52x+3y-z=12 2x-y+z=18 z-y-x=4对于回答全对者,本人会给予奖励,
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/17 01:10:38
![a+b=3 x+y=3 x+y+z=26 b+c=-2 y+z=5 x-y=1 c+a=7 z+x=6 2x-y+z=18 三元一次方程组,3x+z=7 x-y=3 x-y+z=2x+y+2z=7 x+y=5 y+z-x=-52x+3y-z=12 2x-y+z=18 z-y-x=4对于回答全对者,本人会给予奖励,](/uploads/image/z/15233824-64-4.jpg?t=a%2Bb%3D3+x%2By%3D3+x%2By%2Bz%3D26+b%2Bc%3D-2+y%2Bz%3D5+x-y%3D1+c%2Ba%3D7+z%2Bx%3D6+2x-y%2Bz%3D18+%E4%B8%89%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%2C3x%2Bz%3D7+x-y%3D3+x-y%2Bz%3D2x%2By%2B2z%3D7+x%2By%3D5+y%2Bz-x%3D-52x%2B3y-z%3D12+2x-y%2Bz%3D18+z-y-x%3D4%E5%AF%B9%E4%BA%8E%E5%9B%9E%E7%AD%94%E5%85%A8%E5%AF%B9%E8%80%85%2C%E6%9C%AC%E4%BA%BA%E4%BC%9A%E7%BB%99%E4%BA%88%E5%A5%96%E5%8A%B1%2C)
a+b=3 x+y=3 x+y+z=26 b+c=-2 y+z=5 x-y=1 c+a=7 z+x=6 2x-y+z=18 三元一次方程组,3x+z=7 x-y=3 x-y+z=2x+y+2z=7 x+y=5 y+z-x=-52x+3y-z=12 2x-y+z=18 z-y-x=4对于回答全对者,本人会给予奖励,
a+b=3 x+y=3 x+y+z=26 b+c=-2 y+z=5 x-y=1 c+a=7 z+x=6 2x-y+z=18 三元一次方程组,
3x+z=7 x-y=3 x-y+z=2
x+y+2z=7 x+y=5 y+z-x=-5
2x+3y-z=12 2x-y+z=18 z-y-x=4
对于回答全对者,本人会给予奖励,
a+b=3 x+y=3 x+y+z=26 b+c=-2 y+z=5 x-y=1 c+a=7 z+x=6 2x-y+z=18 三元一次方程组,3x+z=7 x-y=3 x-y+z=2x+y+2z=7 x+y=5 y+z-x=-52x+3y-z=12 2x-y+z=18 z-y-x=4对于回答全对者,本人会给予奖励,
3x+z=7 --- ① x-y=3 ---② x-y+z=2 ---③
由③式减去②式 得 x-y+z-(x-y)=z=2-3=-1 得到z=-1 带入①式得3x=8 x=8/3 再带入②式
得y=-1/3
后面2道题用这种方法就可以做出来了 自己做吧 孩子 不要这么懒
5x+2y=38-->15x+6y=114 ①+③: 7x+3y=7-->14x+6y=14 15x+6y=4x+y-z=12 1 x+y+z=26 2 3x+2y+z=-5 3 1+2得, 5x+2y=38
你输的题目全并在一块,很难看懂,是a+b=3 还是 a+b=3x+y=------
????
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