方程组 (1)x+2y=3,3x-y=5 (2)3分之x-2=5分之y+4,2x-7y=90 (3)3m-4n=7,9m-10n+25=0 这3道题怎么算方程组 (1)x+2y=3,3x-y=5 (2)3分之x-2=5分之y+4,2x-7y=90 (3)3m-4n=7,9m-10n+25=0 这3道题怎么算,
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![方程组 (1)x+2y=3,3x-y=5 (2)3分之x-2=5分之y+4,2x-7y=90 (3)3m-4n=7,9m-10n+25=0 这3道题怎么算方程组 (1)x+2y=3,3x-y=5 (2)3分之x-2=5分之y+4,2x-7y=90 (3)3m-4n=7,9m-10n+25=0 这3道题怎么算,](/uploads/image/z/975760-16-0.jpg?t=%E6%96%B9%E7%A8%8B%E7%BB%84+%EF%BC%881%EF%BC%89x%2B2y%3D3%2C3x-y%3D5+%282%293%E5%88%86%E4%B9%8Bx-2%3D5%E5%88%86%E4%B9%8By%2B4%2C2x-7y%3D90+%283%293m-4n%3D7%2C9m-10n%2B25%3D0+%E8%BF%993%E9%81%93%E9%A2%98%E6%80%8E%E4%B9%88%E7%AE%97%E6%96%B9%E7%A8%8B%E7%BB%84+%EF%BC%881%EF%BC%89x%2B2y%3D3%2C3x-y%3D5+%282%293%E5%88%86%E4%B9%8Bx-2%3D5%E5%88%86%E4%B9%8By%2B4%2C2x-7y%3D90+%283%293m-4n%3D7%2C9m-10n%2B25%3D0+%E8%BF%993%E9%81%93%E9%A2%98%E6%80%8E%E4%B9%88%E7%AE%97%2C)
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