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Автор - ann1444

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Автор - ssuper99999

 frac{4 - a}{a}  +  frac{a}{4 + a}  =  frac{(4 - a)(4 + a) +  {a}^{2} }{a(a + 4)}  =  \  =  frac{16 -  {a}^{2} +  {a}^{2}   }{a(a + 4)}  =  frac{16}{ {a}^{2} + 4a }
 frac{2 - c}{2 + c}  -  frac{2 + c}{2 - c}   =  \  frac{(2 - c) {}^{2}  { - (2 + c) {}^{2} }^{} }{4 -  {c}^{2} }  =  frac{4 - 4c +  {c }^{2} - 4 - 4c -  {c}^{2}  }{4 -  {c}^{2} }  = 0

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