a) 125 . 124 - 125 . 50 + 125 . 24

=125 . ( 124 - 50 + 24 )

=125 . 98

=12250

b) 295 - ( 93 - $3^2$ . 7 )

=295 - ( 93 - 9 . 7

=295 - ( 93 - 63 )

=295 - 30

=265

c) $4^2$ . 84 - $4^2$ . 54 - 80

=$4^2$ . ( 84 - 54 ) - 80

=$4^2$ . 30 - 80

=16 . 30 - 80

=480 - 80

=400

d) ( $2^10$ . 4 + $2^10$ . 12) : $2^12$

= [ $2^10$ . ( 4 + 12 ) ] : $2^12$

= [ $2^10$ . 16 ] : $2^12$

= [ $2^10$ . $2^4$ ] : $2^12$

= $2^14$ : $2^12$

= $2^2$

= 4

e) $2^3$ . 15 - [ 115 - $(12-5)^2$ ]

=8 . 15 - [ 115 - $7^2$ ]

=8 . 15 - [ 115 - 49]

=8 . 15 - 66

=120 - 66

=54

f) 100 : { 250 : [ 450 - ( 4 . $5^3$ - $2^2$ . 25 )]}

=100 : { 250 : [ 450 - ( 4 . 125 - 4 . 25 )]}

=100 : { 250 : [ 450 - ( 500 - 100 )]}

=100 : { 250 : [ 450 - 400 ]}

=100 : { 250 : 50 }

=100 : 5

=20

g) 178 . $2^5$ - 78 . $2^5$

=$2^5$ . ( 178 - 78 )

=32 . 100

=3200

h) 20 . 63 + 20 . 36 + 20

=20 . 63 + 20 . 36 + 20 . 1

=20 . ( 63 + 36 + 1)

=20 . 100

=2000

i) 35 - [ 29 - $(5-2)^2$ ] + 2016

=35 - [ 29 - $3^2$ ] + 2016

=35 - [ 29 - 9 ] + 2016

=35 - 20 + 2016

=15 + 2016

=2031

k)3 . $5^2$ - 16 : $2^2$

=3 . 25 - 16 : 4

=75 - 4

=71