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Cảm ơn nhưng mình tìm ra đáp án rồi :
\(\frac{-1997\times1996+1}{\left(-1995\right)\left(-1997\right)+1996}=\frac{-1997\times\left(1995+1\right)+1}{1995\times1997+1996}=\frac{-1997\times1995-1997+1}{1995\times1997+1996}=\frac{-1997\times1995-1996}{1995\times1997+1996}=\frac{-\left(1997\times1995+1996\right)}{1995\times1997+1996}=-1\)
\(\frac{-1997\cdot1996+1}{-1995\cdot\left(-1997\right)+1996}\)
\(=\frac{-1997\cdot\left(1995+1\right)+1}{1995\cdot1997+1996}\)
\(=\frac{-1997\cdot1995+\left(-1997\right)+1}{1995\cdot1997+1996}\)
\(=\frac{-1997\cdot1995+\left(-1996\right)}{1995\cdot1997+1996}\)
\(=-1\)
\(\frac{-1997.1996+1}{-1995.\left(-1997\right)+1996}\)
\(=\frac{-1997.1996+1}{1995.1997+1996}\)
\(=\frac{-1997.\left(1995+1\right)+1}{1995.1997+1996}\)
\(=\frac{-1997.1995+-1997+1}{1995.1997+1996}\)
\(=\frac{1995.-1997+-1996}{1995.1997+1996}\)
\(=\frac{-\left(1995.1997+1996\right)}{1995.1997+1996}\)
\(=-1\)
nếu là (-1997*1996 + 1)/(-1995*1997 +1996) thì:
(-1997*1996+1)/(-1997*1995+1997-1)=(-1997*1996+1)/(-1997*1996-1)
\(\frac{-1997.1996+1}{\left(-1995\right).\left(-1997\right)+1996}=\frac{-1997\left(1995+1\right)+1}{1995.1997+1996}\)
\(=\frac{-1997.1995+\left(-1997\right)+1}{1995.1997+1996}=\frac{-1997.1995+\left(-1996\right)}{1995.1997+1996}=-1\)
1997.1996+1=1997.(1995+1)+1=1997.1995+19971+1=1997.1995+1998
\(\frac{1997x1996+1}{1995x1997+1996}\)=\(\frac{1996+1}{1995+1996}\)=\(\frac{1}{1995}\)