Question

2.7的2.3次方 和2.3的3.2次方怎么比大小?

Answer 1

设2.7^2.3=a, 2.3^3.2=b 则 lga=2.3lg2.7, lgb=3.2lg2.3 , 因为

2.3lg2.7-3.2lg2.3=2.3(lg2.7-lg2.3)-0.9lg2.3=lg(27/23)^2.3-lg2.3^0.9

而(27/23)^2.3