1×1/3{[(31/53) - (-26×81)]/ [(186/28) × (36+(-283))]}
\(1* { 1\over3 }*{\left \{ { 31\over 53} -(-26*81)\over { 186\over 28}*\left [36+(-283)\right ]\right \}}=\)
\(={ 1\over3 }*{\left \{ { 31\over 53} -(-2106)\over { 186\over 28}*\left [36-283\right ]\right \}}=\)
\(={ 1\over3 }*{\left \{ { 31\over 53} +2106\over { 186\over 28}*\left [-247\right ]\right \}}=\)
\(={ 1\over3 }*{\left \{ 2106{ 31\over 53}\over -1640{ 11\over 14}\right \}}=\)
\(={ 1\over3 }*\left \{-1,283888\right \}=\)
\(=-0,42796\)
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