private JPanel[] getNumPanel() {
		JPanel[] ps = new JPanel[oNum];
		for (int k = 0; k < ps.length; k++) {
			JPanel panel = new JPanel();
			panel.setLayout(new FlowLayout(FlowLayout.RIGHT));
			panel.add(new JLabel((k + 1) + "-th num: "));
			for (int i = numFlds[k].length - 1; i >= 0; i--) {
				panel.add(numFlds[k][i]);
				if (i != 0)
					panel.add(new JLabel("s^" + i + "+"));
			}
			ps[k] = panel;
		}
		return ps;
	}