Define a new operation a*b=ab+a+b (eg 3*4=3*4+3+4=19). Calculate (4*5)*(5*6)=how much.
定义新运算a※b=ab+a+b(例如3※4=3*4+3+4=19)．计算(4※5)※(5※6)=多少．
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">20 + 4 + 5</gadget>
<output>29</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">30 + 5 + 6</gadget>
<output>41</output>

<gadget id="calculator">29 * 41</gadget>
<output>1_189</output>

<gadget id="calculator">1_189 + 29 + 41</gadget>
<output>1_259</output>

<result>1_259</result>