<form name=fquad>
<table align="center">
<tr>
<td>
<h2>
<input name=fa size=4>
<font color="#33FF33">x<SUP>2</SUP>+</font>
<input name=fb size=4>
<font color="#33FF33"> x +</font>
<input name=fc size=4>
<font color="#33FF33">= 0</font>
<input type=button value="求值" onClick="checkQuad()">
<input type=reset value="重填">
</h2>
</td>
</tr>
<tr>
<td>
<h2> <font color="#33FF33">x<sub>1</sub>=</font>
<input name=x1 size=45>
<br>
<font color="#33FF33">x<sub>2</sub>=
</font>
<input name=x2 size=45>
</h2>
</td>
</tr>
</table>
</form>
