Xiaopang starts from point A of the counting ray, first walks 42 squares to the right, then walks 20 squares to the left, 11 squares to the right, and stops at point B by 15 squares to the left. If each fight means 0.1, then the distance between AB How many
小胖从数射线A点出发，先向右走42格，再依次向左走20格，向右走11格，向左走15格停在B点，如果每格斗表示0.1，那么AB间相距多少
<gadget id="calculator">42 - 20</gadget>
<output>22</output>

<gadget id="calculator">11 - 15</gadget>
<output>-4</output>

<gadget id="calculator">22 + (-4)</gadget>
<output>18</output>

<gadget id="calculator">18 * 0.1</gadget>
<output>1.8</output>

<result>1.8</result>