七年级下二元一次方程题(1) 丨m+n-5丨+(4m+3n-5)²=0求m、n的值.(2) 方程组中 {3x+5y=k① {5x+2y=k② 中,x+y=2,求k的值.(3) 已知{2x-3y+2z=0①{x+4y-3z=0② 1.求x:z的值 2.求x:y的值 (4) {4
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![七年级下二元一次方程题(1) 丨m+n-5丨+(4m+3n-5)²=0求m、n的值.(2) 方程组中 {3x+5y=k① {5x+2y=k② 中,x+y=2,求k的值.(3) 已知{2x-3y+2z=0①{x+4y-3z=0② 1.求x:z的值 2.求x:y的值 (4) {4](/uploads/image/z/5396465-65-5.jpg?t=%E4%B8%83%E5%B9%B4%E7%BA%A7%E4%B8%8B%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E9%A2%98%EF%BC%881%EF%BC%89+%E4%B8%A8m%2Bn-5%E4%B8%A8%2B%EF%BC%884m%2B3n-5%29%26%23178%3B%3D0%E6%B1%82m%E3%80%81n%E7%9A%84%E5%80%BC.%EF%BC%882%EF%BC%89+%E6%96%B9%E7%A8%8B%E7%BB%84%E4%B8%AD+%EF%BD%9B3x%2B5y%3Dk%E2%91%A0+%EF%BD%9B5x%2B2y%3Dk%E2%91%A1+%E4%B8%AD%2Cx%2By%3D2%2C%E6%B1%82k%E7%9A%84%E5%80%BC.%EF%BC%883%EF%BC%89+%E5%B7%B2%E7%9F%A5%EF%BD%9B2x-3y%2B2z%3D0%E2%91%A0%EF%BD%9Bx%2B4y-3z%3D0%E2%91%A1+1.%E6%B1%82x%EF%BC%9Az%E7%9A%84%E5%80%BC+2.%E6%B1%82x%EF%BC%9Ay%E7%9A%84%E5%80%BC+%EF%BC%884%EF%BC%89+%EF%BD%9B4)
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