a) 42 . 121 - 42 . 22 + 42
= 42 . 121 - 42 . 22 + 42 . 1
= 42 . ( 121 - 22 + 1 )
= 42 . 100
= 16 . 100
= 1600
b) 600 - 400 : [ 118 . 2 - ( 50 . 3 - 9 . 16 )2 ]
= 600 - 400 : [ 118 . 2 - ( 150 - 144 )2 ]
= 600 - 400 : ( 118 . 2 - 62 )
= 600 - 400 : ( 236 - 36 )
= 600 - 400 : 200
= 600 - 2
= 598
c) |- 15 + 10|+|( - 48 ) + ( - 22 )|+ ( - 100 )
= |- 5|+|- 70|+ ( - 100 )
= 5 + 70 + ( - 100 )
= 75 + ( - 100 )
= - 25
d) 52 - ( - 8 ) -|- 17|
= 25 - ( - 8 ) - 17
= 25 + 8 - 17
= 33 - 17
= 16
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