68*34+68*67-68．
68*34+68*67-68．
<gadget id="calculator">68 * 34</gadget>
<output>2_312</output>

<gadget id="calculator">68 * 67</gadget>
<output>4_556</output>

<gadget id="calculator">4_556 - 68</gadget>
<output>4_488</output>

<gadget id="calculator">2_312 + 4_488</gadget>
<output>6_800</output>

<result>6_800</result>