The sum of the minuend, the subtrahend and the difference is 6, the subtrahend is 1.3, what is the difference.
被减数、减数与差的和是6，减数是1.3，差是多少．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 - 1.3</gadget>
<output>1.7</output>

<result>1.7</result>