= 3- 1+1/4:2

=17/8

12 . 53 + 53 . 16 + 28 . 47

= 53 . ( 12 + 16 ) + 28 . 47

= 53 . 28 + 28 .47

= ( 53 + 47 ) . 48

= 100 . 48

= 4800

78 . 31 . 78 . 24 + 78 . 17 + 22 . 72

= 78 . ( 31 + 24 + 17 ) + 22 . 72

= 78 . 72 + 22 . 72

= ( 78 + 22 ) . 72

= 100 . 72

= 7200

32 x 125 x 3

= 8 . 4 + 125 . 3

= ( 125 . 8 ) . ( 4 . 3 )

= 1000 . 12

= 12000