解二元一次方程,要步骤(急,今晚就要) Y - (X - Y) = 3 X + (X - Y) = 45Y - (X - Y) = 3 X + (X - Y) = 45
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![解二元一次方程,要步骤(急,今晚就要) Y - (X - Y) = 3 X + (X - Y) = 45Y - (X - Y) = 3 X + (X - Y) = 45](/uploads/image/z/3969823-31-3.jpg?t=%E8%A7%A3%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%2C%E8%A6%81%E6%AD%A5%E9%AA%A4%EF%BC%88%E6%80%A5%2C%E4%BB%8A%E6%99%9A%E5%B0%B1%E8%A6%81%EF%BC%89+Y+-+%28X+-+Y%29+%3D+3+X+%2B+%28X+-+Y%29+%3D+45Y+-+%28X+-+Y%29+%3D+3+X+%2B+%28X+-+Y%29+%3D+45)
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