Question 975798
Do you mean {{{ (1/4a-b)(1/16a^2+1/4ab+ab^2)}}} ?
Is the 1st term {{{(1/4)a - b}}} ?
Or {{{1/(4a - b)}}} ?
Or something else?
Parentheses are free.  Use some.
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Problems that are ambiguous seem to be ignored until they scroll off the list.