a) x= 4^15 , y= 3×4^14
x=2^30=2^28x4
y=2^28x3
x>y
b) x= 9^4×27^3 , y= 3^5×81^2
x=3^8x3^9=3^17
y=3^5x3^8=3^13
x>y
c) x= (2×5)^4× 10, y= (10^2)^3
x=10^4x10=10^5
y=10^6
x<y
d) x= (5^7:5^3)^4, y= 25^8
x=(5^4)^4=5^16
y=(5^2)^8=5^16
x=y
e) x= (2^3:2)^6, y= (2^4)^3
x=(2^2)^6=2^12
y=2^12
x=y