public RationalMatrix2x2 mult(RationalMatrix2x2 rmatr) {
        RationalMatrix2x2 result = new RationalMatrix2x2();
        for (int i = 0; i < 2; i++) {
            for (int j = 0; j < 2; j++) {
                for (int k = 0; k < 2; k++) {
                    result.matrix[i][j] += this.matrix[i][k].mult(rmatr.getMatrix()[k][j]);
                }
            }
        }
        return result;
    }