Tính nhanh

1) tính nhanh
a) ( 9/25 - 2,18 ) : ( 3 nguyên 4/5 + 0,2 )
b) 3/8 . 19 nguyên 1/3 - 3/8 . 33 nguyên 1/3
c) 1 nguyên 4/23 + 5/21 -4/23 + 0,5 + 16/21
d) 13/25 + 6/41 - 38/25 + 35/41 - 1/2
e) 12 . (-2/3) ^2 + 4/3
f) 12,5 . ( - 5/7 ) + 1,5 . ( - 5/7 )
g) ( 3/4 - 5/6 ) ^ 2
h) 5^4 .20^4 / 25 ^ 5 . 4 ^ 5