Tính

c) (1+2/3-1/4)(0,8-3/4)^2
d) (-2/3)^3.(3/4)^2
e)23 1/4.7/5-13 1/4:5/7
d) 2^4.2^6/(2^5)^2-2^5.15^3/6^3.10^2