来自段洣毅的问题
用加减法解方程组:7x-3y=77x+11y=-21解方程组:x=12x-3y+z=113x+2y+2z=5解方程组:5x-3y+z=25x+2y-4z=3-5x+y-z=2解方程组:x+3y=23Y+3z=27Z+3y=22解方程组:x-y-z=-13x+5y+7z=114x-y+2z=-1
用加减法解方程组:7x-3y=7
7x+11y=-21
解方程组:x=1
2x-3y+z=11
3x+2y+2z=5
解方程组:5x-3y+z=2
5x+2y-4z=3
-5x+y-z=2
解方程组:x+3y=23
Y+3z=27
Z+3y=22
解方程组:x-y-z=-1
3x+5y+7z=11
4x-y+2z=-1
1回答
2020-05-14 22:33