Thực hiện phép tính
a) 15/6 : (1/2 - 2/3)^2
b) 15/34 + 7/21 + 19/34 - 1_15/17 + 2/3
c) 1_4/23 + 5/21 - 4/23 + 0,5 + 16/21
d) 3/4 . 26_2/9 - 38_2/9 . 3/4
e) 35_1/6 : (-4/5) - 45_1/6 : (-4/5)
b) 15/34 + 7/21 + 19/34 - 1_15/17 + 2/3
c) 1_4/23 + 5/21 - 4/23 + 0,5 + 16/21
d) 3/4 . 26_2/9 - 38_2/9 . 3/4
e) 35_1/6 : (-4/5) - 45_1/6 : (-4/5)