a) 132 + 77 + 198
= 11 x 12 + 11 x 7 + 11 x 18
= 11 x ( 12 + 7 + 18 )
= 11 x 37
b) 5555 + 6767 + 7878
= 55 x 101 + 67 x 101 + 78 x 101
= ( 55 + 67 + 78 ) x 101
= 200 x 101
c) 1997, 1997 + 1998, 1998 + 1999, 1999
= 1997 x 1,0001 + 1998 x 1,0001 + 1999 x 1,0001
= ( 1997 + 1998 + 1999 ) x 1,0001
= 5994 x 1,0001.
a) 132 + 77 + 198
= 11 x 12 + 11 x 7 + 11 x 18
= 11 x ( 12 + 7 + 18 )
= 11 x 37
b) 5555 + 6767 + 7878
= 55 x 101 + 67 x 101 + 78 x 101
= ( 55 + 67 + 78 ) x 101
= 200 x 101
c) 1997, 1997 + 1998, 1998 + 1999, 1999
= 1997 x 1,0001 + 1998 x 1,0001 + 1999 x 1,0001
= ( 1997 + 1998 + 1999 ) x 1,0001
= 5994 x 1,0001.