限期是今天下午16:30利用加减消元法解下列联立二元一次方程(在左手边有一个大括号)1.5x - 3y = 1-5x + y = 32.4x - 3y = -23x + y = 53.3y + 2 =127x - 6y =94.已知某个数是另一个数的4倍.若它们的和是30,求这
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![限期是今天下午16:30利用加减消元法解下列联立二元一次方程(在左手边有一个大括号)1.5x - 3y = 1-5x + y = 32.4x - 3y = -23x + y = 53.3y + 2 =127x - 6y =94.已知某个数是另一个数的4倍.若它们的和是30,求这](/uploads/image/z/9304512-24-2.jpg?t=%E9%99%90%E6%9C%9F%E6%98%AF%E4%BB%8A%E5%A4%A9%E4%B8%8B%E5%8D%8816%3A30%E5%88%A9%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%E8%81%94%E7%AB%8B%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%28%E5%9C%A8%E5%B7%A6%E6%89%8B%E8%BE%B9%E6%9C%89%E4%B8%80%E4%B8%AA%E5%A4%A7%E6%8B%AC%E5%8F%B7%291.5x+-+3y+%3D+1-5x+%2B+y+%3D+32.4x+-+3y+%3D+-23x+%2B+y+%3D+53.3y+%2B+2+%3D127x+-+6y+%3D94.%E5%B7%B2%E7%9F%A5%E6%9F%90%E4%B8%AA%E6%95%B0%E6%98%AF%E5%8F%A6%E4%B8%80%E4%B8%AA%E6%95%B0%E7%9A%844%E5%80%8D.%E8%8B%A5%E5%AE%83%E4%BB%AC%E7%9A%84%E5%92%8C%E6%98%AF30%2C%E6%B1%82%E8%BF%99)
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