Bài làm :
\(1992.19911991-1991.19921992\)
\(=1992.1991.10001-1991.1992.10001\)
\(=0\)
=1992.1991.101-1991.1992.101
=1992.1991-1991.1992
=0 hok tốt nha nhớ k đó hihi
=1992.1991.10001-1991.1992.10001
=1992.1991-1991.1992
\(1992.19911991-1991.19921992\)
\(=1992\left(19910000+1991\right)-1991\left(19920000+1992\right)\)
\(=1992.1991.10000+1991-1991.1992.10000+1992\)
\(=1992.1991.10001-1991.1992.10001\)
\(=0\)
bằng (1992-1991)*19921992
= 1 *19921992
= 19921992
