a) ( 519 : 517 + 3 ) : 7
= ( 25 + 3 ) : 7
= 28 : 7
= 4
b) 79 : 77- 32 + 23 . 52
= 49 - 9 + 8 . 25
= 49 - 9 + 200
= 40 + 200
= 240
c) 1200 : 2 + 62 . 21 + 18
= 600 + 36 . 2 + 18
= 600 + 72 + 18
= 672 + 18
= 690
d) 59 : 57 + 70 : 14 - 20
= 25 + 70 : 14 - 20
= 25 + 5 - 20
= 30 - 20
= 10
e) 100 : 52 + 7 . 32
= 100 : 25 + 7 . 9
= 4 + 63
= 67
f ) 84 : 4 + 39 : 37 + 50
= 21 + 9 + 1
= 30 + 1
= 31
g) 32 . 5 - 22 . 7 + 83
= 9 . 5 - 4 . 7 + 83
= 45 - 28 + 83
= 17 + 83
= 100
h) 59 : 57 + 12 . 3 + 70
= 25 + 36 + 1
= 61 + 1
= 62
i) 5 . 22 + 98 : 72
= 5 . 4 + 98 : 49
= 20 + 2
= 22