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a guest Nov 14th, 2019 92 Never
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  1. public static void main(String[] args) {
  2.         double[][] A = {{2, 0, -1, -2}, {0, 1, 2, -1}, {1, -1, 0, -1}, {-1, 3, -2, 0}}; //Коэф. уравнений
  3.         double[] B = {-8, -1, -6, 7}; //Значения
  4.  
  5.         ArrayList<Double> xValues = new ArrayList<>(4);
  6.  
  7.         for(int i = 0; i < 4; i++) {
  8.             xValues.add((double) 0);
  9.         }
  10.  
  11.         int k = 0;
  12.         double prevX = 0;
  13.  
  14.         while(xValues.get(4-1) - prevX > 0.000001 || k == 0) {
  15.  
  16.             prevX = xValues.get(4-1);
  17.  
  18.             System.out.println("k = " + k);
  19.             System.out.println();
  20.  
  21.             double x = 0;
  22.  
  23.             for(int i = 0; i < 4; i++) {
  24.  
  25.                 for(int j = 0; j < 4; j++) {
  26.                     x += xValues.get(j) * A[i][j];
  27.                 }
  28.  
  29.                 x += B[i];
  30.                 xValues.set(i,x);
  31.                 System.out.print("X" + (i+1) +": " + x);
  32.                 System.out.println();
  33.  
  34.                 x = 0;
  35.             }
  36.  
  37.             k++;
  38.         }
  39.         System.out.println(xValues);
  40.     }
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