Two integer parts are multiplied with one decimal place of 4, and the approximate value of the product rounded off to one decimal place is 18.1. What is the exact value of the product of these two numbers?
两个整数部分都是4的一位小数相乘，乘积用四舍五入法保留一位小数的近似值是18.1．这两个数乘积的准确值是多少．
<gadget id="calculator">4.2 * 4.3</gadget>
<output>18.06</output>

<result>18.06</result>