Question

Tính nhanh:
\((45\times46+47\times48)\times(51\times52-49\times48)\times(45\times128-90\times64)\times(1995\times1996+1997\times1998)\)

Answer 1

\(=\left(45\cdot128-45\cdot128\right)\cdot\left(45\cdot46+47\cdot48\right)\cdot\left(51\cdot52-49\cdot48\right)\cdot\left(1995\cdot1996+1997\cdot1998\right)\)

=0*A

=0