具有最大可能大小的Div(列跨可用宽度)

I have a parent div of a fixed width, and 3 divs inside, in one line. I would like that the 2nd and 3rd divs have the widths that fit its' contents, and 1st div would occupy the rest of the parent's width. All divs are single lines of text (I have a parent div of a fixed width, and 3 div