例句與造句

1. And then take E, remove the digit " 7 " terms, get series F, invert it for series G . . . . can we do this an infinite number of times to get an infinite number of convergent series?
2. I'm saying yes, because of the following reasoning : Let A be the harmonic series, let B be the harmonic series with all the digit " 9 " terms removed, and let C be the inverse series of B ( AKA instead of removing the digit " 9 " terms, remove all the other terms instead ).
3. It's difficult to find remove the digit in a sentence. 用remove the digit造句挺難的