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zzz70047

 {n}^{2}  -  {m}^{2}

9 -  {c}^{2}

 {a}^{2}  - 49

 {a}^{2}  -  frac{4}{81}

0,16-0,4m+0,4n-mn

 {d}^{2}  -  frac{121}{25}

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