1.已知 { x+y=5 Y+z=-2 Z+x=3 求x+y+z的值.2.两元一次方程组 { 3x+2y=m+3 2x-y=2m-1 的解互为相反数,1.已知 { x+y=5Y+z=-2Z+x=3 求x+y+z的值.2.两元一次方程组 { 3x+2y=m+32x-y=2m-1 的解互为相反数,求m的值.
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![1.已知 { x+y=5 Y+z=-2 Z+x=3 求x+y+z的值.2.两元一次方程组 { 3x+2y=m+3 2x-y=2m-1 的解互为相反数,1.已知 { x+y=5Y+z=-2Z+x=3 求x+y+z的值.2.两元一次方程组 { 3x+2y=m+32x-y=2m-1 的解互为相反数,求m的值.](/uploads/image/z/2713385-65-5.jpg?t=1.%E5%B7%B2%E7%9F%A5+%7B+x%2By%3D5+Y%2Bz%3D-2+Z%2Bx%3D3+%E6%B1%82x%2By%2Bz%E7%9A%84%E5%80%BC.2.%E4%B8%A4%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84+%7B+3x%2B2y%3Dm%2B3+2x-y%3D2m-1+%E7%9A%84%E8%A7%A3%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C1.%E5%B7%B2%E7%9F%A5+%7B+x%2By%3D5Y%2Bz%3D-2Z%2Bx%3D3+%E6%B1%82x%2By%2Bz%E7%9A%84%E5%80%BC.2.%E4%B8%A4%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84+%7B+3x%2B2y%3Dm%2B32x-y%3D2m-1+%E7%9A%84%E8%A7%A3%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E6%B1%82m%E7%9A%84%E5%80%BC.)
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