2.把下列各数填在相应的括号内
-7,3.5,3.1415926,0,$\frac{17}{13}$,0.03%,-3$\frac{1}{4}$,10,-3π,1.010010001…(相邻两个1之间0的个数逐次加1),0.$\stackrel{•}{5}\stackrel{•}{7}$,1.121 221 222.
自然数集合{10 …};
正分数集合 {3.5,3.1415926,$\frac{17}{13}$,0.03%,0.$\stackrel{•}{5}\stackrel{•}{7}$,1.121221222 …};
负数集合{-7,-3$\frac{1}{4}$,-3π …};
无理数集合 {-3π,1.010010001…(相邻两个1之间0的个数逐次加1)… …};
有理数集合{-7,3.5,3.1415926,0,$\frac{17}{13}$,0.03%,-3$\frac{1}{4}$,10,0.$\stackrel{•}{5}\stackrel{•}{7}$,1.121221222…}.