45*55+55*56-55．
45*55+55*56-55．
<gadget id="calculator">45 * 55</gadget>
<output>2_475</output>

<gadget id="calculator">55 * 56</gadget>
<output>3_080</output>

<gadget id="calculator">3_080 - 55</gadget>
<output>3_025</output>

<gadget id="calculator">2_475 + 3_025</gadget>
<output>5_500</output>

<result>5_500</result>