若abcd均为正实数,且a>b,那么b/a .a/b .(b+c)/(a+c).(a+d)/(b+d)比大小

问题描述:

若abcd均为正实数,且a>b,那么b/a .a/b .(b+c)/(a+c).(a+d)/(b+d)比大小

b/a

.a/b>(a+d)/(b+d)>(b+c)/(a+c)>b/a

a/b > (a+d)/(b+d) > (b+c)/(a+c) > b/a