Tính nhanh :
A = \(2016.20152015-2015.20162016\)
= \(2016.2015.10001-2015.2016.1001\)
=0
\(A=2016.20152015-2015.20162016\)
\(=2016.2015.10001-2015.2016.10001\)
\(=0\)
Tính :
\(\dfrac{1993+1993.1994}{1992.1995+1995}\)= \(\dfrac{1993.1+1993.1994}{1992.1995+1995.1}\)=\(\dfrac{1993\left(1+1994\right)}{1995\left(1992+1\right)}\)=\(\dfrac{1993.1995}{1995.1993}=1\)
\(\dfrac{1993+1993.1994}{1992.1995+1995}\)
\(=\dfrac{1993.1+1993.1994}{1992.1995+1995.1}\)
\(=\dfrac{1993\left(1+1994\right)}{1995\left(1992+1\right)}\)
\(=\dfrac{1993.1995}{1995.1993}=1\)
Tính nhanh :
A = 2016.20152015 − 2015.20162016
= 2016.2015.10001 − 2015.2016.10001
=0