初一下学期的二元一次方程1.已知|m+n+2|+(m-2n+8)的平方=0,求mn的值.2.已知等式(2A-7B)x+(3A+8B)=8x+10 对一切有理数x都成立,求A,B的值.3.甲,乙同时解方程组{Ax+By=2,① Cx-7y=8,②,甲正确得解{x=3
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![初一下学期的二元一次方程1.已知|m+n+2|+(m-2n+8)的平方=0,求mn的值.2.已知等式(2A-7B)x+(3A+8B)=8x+10 对一切有理数x都成立,求A,B的值.3.甲,乙同时解方程组{Ax+By=2,① Cx-7y=8,②,甲正确得解{x=3](/uploads/image/z/568167-15-7.jpg?t=%E5%88%9D%E4%B8%80%E4%B8%8B%E5%AD%A6%E6%9C%9F%E7%9A%84%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B1.%E5%B7%B2%E7%9F%A5%7Cm%2Bn%2B2%7C%2B%EF%BC%88m-2n%2B8%EF%BC%89%E7%9A%84%E5%B9%B3%E6%96%B9%3D0%2C%E6%B1%82mn%E7%9A%84%E5%80%BC.2.%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%BC%8F%EF%BC%882A-7B%EF%BC%89x%2B%EF%BC%883A%2B8B%EF%BC%89%3D8x%2B10+%E5%AF%B9%E4%B8%80%E5%88%87%E6%9C%89%E7%90%86%E6%95%B0x%E9%83%BD%E6%88%90%E7%AB%8B%2C%E6%B1%82A%2CB%E7%9A%84%E5%80%BC.3.%E7%94%B2%2C%E4%B9%99%E5%90%8C%E6%97%B6%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84%EF%BD%9BAx%2BBy%3D2%2C%E2%91%A0+Cx-7y%3D8%2C%E2%91%A1%2C%E7%94%B2%E6%AD%A3%E7%A1%AE%E5%BE%97%E8%A7%A3%EF%BD%9Bx%3D3)
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