do well in是等于be better at还是be better in?

do well in是等于be better at还是be better in? be better than sb 是 in 还是 at sth? 是be better do 还是better to do . do well in 和be goog at是+DOING还是DO be good at do well in 这两个后面是加do 还是 doing be better do还是be better to do be good at与 do well in do well in与be good at be good at与do well in be good at do well in 造句, be better with=be better at? be better at 意思