用加减消元法解下列方程组,1.{9+2y=-1,9x-3y=92.11+5y=-28,2x+5y=-13.{8x-3y=12,2x+5y=264.{2x+3y=1,3x-5y=685.{6x+y=5,6x-y=3
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![用加减消元法解下列方程组,1.{9+2y=-1,9x-3y=92.11+5y=-28,2x+5y=-13.{8x-3y=12,2x+5y=264.{2x+3y=1,3x-5y=685.{6x+y=5,6x-y=3](/uploads/image/z/2582553-57-3.jpg?t=%E7%94%A8%E5%8A%A0%E5%87%8F%E6%B6%88%E5%85%83%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B%E7%BB%84%2C1.%7B9%2B2y%3D-1%2C9x-3y%3D92.11%2B5y%3D-28%2C2x%2B5y%3D-13.%7B8x-3y%3D12%2C2x%2B5y%3D264.%7B2x%2B3y%3D1%2C3x-5y%3D685.%7B6x%2By%3D5%2C6x-y%3D3)
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用加减消元法解下列方程组,1.{9+2y=-1,9x-3y=92.11+5y=-28,2x+5y=-13.{8x-3y=12,2x+5y=264.{2x+3y=1,3x-5y=685.{6x+y=5,6x-y=3
用加减消元法解下列方程组,
1.{9+2y=-1,9x-3y=9
2.11+5y=-28,2x+5y=-1
3.{8x-3y=12,2x+5y=26
4.{2x+3y=1,3x-5y=68
5.{6x+y=5,6x-y=3
用加减消元法解下列方程组,1.{9+2y=-1,9x-3y=92.11+5y=-28,2x+5y=-13.{8x-3y=12,2x+5y=264.{2x+3y=1,3x-5y=685.{6x+y=5,6x-y=3
27+6y=-3-----1
18x-6y=18----2
由1+2得:18x+27=15解得x=-2/3代入1式得:y=-5
下面几道题都可以这么解
实际上完全可以用代入消元法来解,有点多此一举
用加减消元法解下列方程组:
3.用加减消元法解下列方程组
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