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2. Multiplicando extremos medios.
3. Simplificar las "x" del numerador y del denominador.
4 2 4 + 2x
-- + --- ----------------
x x^2 x x( 4 + 2x) 4 + 2x
---------------- = ---------------------- = ------------------- = -----------
2 1 2x + 1 x(2x + 1) 2x + 1
--- + ---- ----------------
1 x x
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