(1)解:有理数集合:{2,0,3√-8,1/3,-5}无理数集合:{√2,π,3√21,2/π,0.3030030003……}分数集合:{2/3}负整数集合:{3√-8,-5}(2)解:(3√21)^3=21π^3>27∴3√21<π满意老师的回答吗,亲?请记得采纳哦