4x-3y=18 3x-4y=17 x/2+y/3=2 0.2x+4x-3y=18 3x-4y=17x/2+y/3=2 0.2x+0.3y=2.82x+y/3=3x-2y/8=3x+y+z=20 2x+y+z=42 x-5z=8错了。是x+y-z=20 2x+y+z=42 x-5z=8
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![4x-3y=18 3x-4y=17 x/2+y/3=2 0.2x+4x-3y=18 3x-4y=17x/2+y/3=2 0.2x+0.3y=2.82x+y/3=3x-2y/8=3x+y+z=20 2x+y+z=42 x-5z=8错了。是x+y-z=20 2x+y+z=42 x-5z=8](/uploads/image/z/1639648-64-8.jpg?t=4x-3y%3D18+3x-4y%3D17+x%2F2%2By%2F3%3D2+0.2x%2B4x-3y%3D18+3x-4y%3D17x%2F2%2By%2F3%3D2+0.2x%2B0.3y%3D2.82x%2By%2F3%3D3x-2y%2F8%3D3x%2By%2Bz%3D20+2x%2By%2Bz%3D42+x-5z%3D8%E9%94%99%E4%BA%86%E3%80%82%E6%98%AFx%2By-z%3D20+2x%2By%2Bz%3D42+x-5z%3D8)
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