5根号5 是说5倍根号5吧,那么英语的话一般念5 times square root of 5,
同样的2根号2 3根号6也是这么念.
补充:
平方根为square root
立方根为cubic root
11次方根eleventh root
12次方根twelfth root
13次方跟thirteenth root
21次方根twenty-first root
22次方根twenty-second root
23次方根twenty-third root
24次方根twenty-fourth root
N次方根为N-th root,N-th当N为21,22,23,31,32,33这样的数的时候,相应的采用xx-first,xx-second,xx-third形式