Respuestas

2012-10-18T02:32:21+02:00

Se multiplican simplemte quedando

(4ab)(5ab)

2012-10-18T02:40:13+02:00

 

( 4a* b ) ( 5a * b ) = ( 4a b ) ( 5a b ) = 20 a2 b2 = 20 (ab)2