a) 3 . 52 - 16 . 22
= 3 . 25 - 16 . 4
= 75 - 64
= 11
b) (49 . 42 - 47 . 42 ) : 47
= [ 42 . (49 - 47 ) ] : 47
= 42 . 2 : 47
= 2
c) 2448 : [ 119 - ( 23 - 6 ) ]
= 2448 : [ 119 - 17 ]
= 2448 : 102
= 24
d) 25 .37 + 37 . 75 - 270
= 37 . ( 25 + 75 ) - 270
= 37 . 100 - 270
= 3700 - 270
= 3430
e) 5 . 32 - 32 : 22
= 5 . 9 - 32 : 4
= 45 - 8
= 37
g) 18 . [ 270 : ( 15 - 12 )2 ]
= 18 . [ 270 : 32 ]
= 18 . [ 270 : 9 ]
= 18 . 30
= 540