[Haskell-beginners] How to save a bracket in this case?

[yi lu]

Hi,

I want to calculate
*(81/10)^2*.

However, after I typed *81/10*, I remembered to add a bracket to surround
*81/10*. Is there one way to do some trick to save this bracket?

Actually I can *Ctrl+A* to move to the first character of this line. I want
the other solution.

Yi
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