Question

比较大小:1/2的2/3方和1/5的2/3方 要怎么比较同指数的

Answer 1

因为 [(1/2)^(2/3)]/[(1/5)^(2/3)]

=[(1/2)/(1/5)]^(2/3)

=(5/2)^(2/3)

>1,

所以(1/2)^(2/3)>(1/5)^(2/3).

= = = = = = =

作比法：比较a,b大小,(a,b>0),则用a/b来判断.

a,b>0,a/b>1,则a>b.

a,b>0,a/b=1,则a=b.

a,b>0,a/