What is the difference between the quotient of 0.25 divided by 3.75 minus the product of 1.8 times 4.5?
0.25除3.75的商减去1.8乘4.5的积，差是多少？
<gadget id="calculator">3.75 / 0.25</gadget>
<output>15</output>

<gadget id="calculator">1.8 * 4.5</gadget>
<output>8.1</output>

<gadget id="calculator">15 - 8.1</gadget>
<output>6.9</output>

<result>6.9</result>