二元一次方程组 1.代数式ax+by,当x=3,y=-2时的值为7,当x=2,y=4时的值为2,求当x=2,y=-3时的值.1.代数式ax+by,当x=3,y=-2时的值为7,当x=2,y=4时的值为2,求当x=2,y=-3时的值.2.若|2x+5y-1|+(13x+10y+16)²=0,求x+y的
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![二元一次方程组 1.代数式ax+by,当x=3,y=-2时的值为7,当x=2,y=4时的值为2,求当x=2,y=-3时的值.1.代数式ax+by,当x=3,y=-2时的值为7,当x=2,y=4时的值为2,求当x=2,y=-3时的值.2.若|2x+5y-1|+(13x+10y+16)²=0,求x+y的](/uploads/image/z/2711479-31-9.jpg?t=%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84+1.%E4%BB%A3%E6%95%B0%E5%BC%8Fax%2Bby%2C%E5%BD%93x%3D3%2Cy%3D-2%E6%97%B6%E7%9A%84%E5%80%BC%E4%B8%BA7%2C%E5%BD%93x%3D2%2Cy%3D4%E6%97%B6%E7%9A%84%E5%80%BC%E4%B8%BA2%2C%E6%B1%82%E5%BD%93x%3D2%2Cy%3D-3%E6%97%B6%E7%9A%84%E5%80%BC.1.%E4%BB%A3%E6%95%B0%E5%BC%8Fax%2Bby%2C%E5%BD%93x%3D3%2Cy%3D-2%E6%97%B6%E7%9A%84%E5%80%BC%E4%B8%BA7%2C%E5%BD%93x%3D2%2Cy%3D4%E6%97%B6%E7%9A%84%E5%80%BC%E4%B8%BA2%2C%E6%B1%82%E5%BD%93x%3D2%2Cy%3D-3%E6%97%B6%E7%9A%84%E5%80%BC.2.%E8%8B%A5%7C2x%2B5y-1%7C%2B%2813x%2B10y%2B16%EF%BC%89%26%23178%3B%3D0%2C%E6%B1%82x%2By%E7%9A%84)
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