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The second question on page 95 of the second grade math book of Beijing Normal University.
Solution: the original formula =a divided by (a? -1)+(3a+ 1) divided by (a? -1)-(2a+3) divided by (a? - 1)

=(a+3a+ 1-2a-3) divided by (a? - 1)

=2(a- 1) divided by (a? - 1)

=2 divided by (a+ 1)

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