It is known that the sum of big and small numbers is 678, and the single digit of the large number is removed to equal the decimal, then what is the large number.
已知大小两数和是678，其中去掉大数的个位数等于小数，则大数是多少．
<gadget id="calculator">100 * 6</gadget>
<output>600</output>

<gadget id="calculator">10 * 1</gadget>
<output>10</output>

<gadget id="calculator">600 + 10 + 7</gadget>
<output>617</output>

<result>617</result>