(1)
a^6=(a^2)^3=2^3=8
b^6=(b^3)^2=3^2=9
==> a^6d^15,即:b>d
(4)
a^10=2^5=32,
d^10=5^2=25
==>a^10>d^10,即:a>d
Ans:b>a=c>d