a, b9, and c26 are a one-digit number, two-digit number and three-digit number respectively; if the sum of these three numbers is 510, find the three-digit number "abc"?
a、b9、c26分別是一个一位数、二位数和三位数；若这三個数的和是510，求三位数「abc」？
<result>474</result>