Rút gọn
\(
A=a - [\frac{\left ( 16-a \right )a}{a^{2}-4}+\frac{3+2a}{2-a}+\frac{3a-2}{2+a}] \div  \frac{a-1}{a\left ( a^{2} +4a+4\right )}
\)
\(
A=a- [\frac{16a-a^{2}-\left ( 2a+3\right )\left ( a+2\right )+\left ( 3a-2 \right )\left ( a-2 \right )}{a^{2}-4}] \times  \frac{a\left ( a+2\right )^{2}}{\left ( a-1 \right )}
\)
     $=a- [ \frac{16a-a^{2}-2a^{2}-7a-6+3a^{2}-8a+4}{\left ( a+2 \right )\left ( a-2 \right )} ] \times \frac{a\left ( a+2\right )^{2}}{\left ( a-1 \right )}$
     $=a- \frac{a\left ( a+2 \right )}{a-1} = \frac{a^{2}-a-a^{2}-2a}{a-1} =\frac{-3a}{a-1} = \frac{3a}{1-a}$

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