解方程组①3x-2y=4 3x-4y=3 ②7x-4y=5 5x+2y=6 ③x+y=5 y+z=9 z+x=12 ④4y=3+4 5y-4=3急
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![解方程组①3x-2y=4 3x-4y=3 ②7x-4y=5 5x+2y=6 ③x+y=5 y+z=9 z+x=12 ④4y=3+4 5y-4=3急](/uploads/image/z/31144-40-4.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84%E2%91%A03x-2y%3D4+3x-4y%3D3+%E2%91%A17x-4y%3D5+5x%2B2y%3D6+%E2%91%A2x%2By%3D5+y%2Bz%3D9+z%2Bx%3D12+%E2%91%A34y%3D3%2B4+5y-4%3D3%E6%80%A5)
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