The difference between two numbers is 10.52. If the minuend increases by 4.2 and the subtrahend decreases by 2.3, what is the difference?
两个数的差是10.52，如果被减数增加4.2，减数减少2.3，那么差是多少．
<gadget id="calculator">4.2 + 2.3</gadget>
<output>6.5</output>

<gadget id="calculator">10.52 + 6.5</gadget>
<output>17.02</output>

<result>17.02</result>