请求帮我分析指导这题要怎样去做,已知:1998(x-y)+1999(y-z)+2000(z-x)=0 (1)1998平方(x-y)+1999平方(y-z)+2000平方(z-x)=1999 (2)求z-y的值
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![请求帮我分析指导这题要怎样去做,已知:1998(x-y)+1999(y-z)+2000(z-x)=0 (1)1998平方(x-y)+1999平方(y-z)+2000平方(z-x)=1999 (2)求z-y的值](/uploads/image/z/7173807-15-7.jpg?t=%E8%AF%B7%E6%B1%82%E5%B8%AE%E6%88%91%E5%88%86%E6%9E%90%E6%8C%87%E5%AF%BC%E8%BF%99%E9%A2%98%E8%A6%81%E6%80%8E%E6%A0%B7%E5%8E%BB%E5%81%9A%2C%E5%B7%B2%E7%9F%A5%EF%BC%9A1998%EF%BC%88x-y%29%2B1999%28y-z%29%2B2000%28z-x%29%3D0+%EF%BC%881%EF%BC%891998%E5%B9%B3%E6%96%B9%EF%BC%88x-y%29%2B1999%E5%B9%B3%E6%96%B9%28y-z%29%2B2000%E5%B9%B3%E6%96%B9%28z-x%29%3D1999+%EF%BC%882%EF%BC%89%E6%B1%82z-y%E7%9A%84%E5%80%BC)
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