Question

So sanh 2/3; 21/31; 211/311; 2112/3112

Answer 1

Ta có: 2/3= 2000/3000 ; 21/31= 2100/3100 ; 211/311= 2110/ 3110

Lại có:   2000/3000 = 1-1000/3000 ;  2100/3100= 1-1000/3100

             2110/3110 = 1-1000/3110 ;  2112/3112= 1-1000/3112

mà 1000/3000>1000/3100>1000/3110>1000/3112

=> Thứ tự đúng là 2000/3000<2100/3100<2110/3110<2112/3112

=> 2/3<21/31<211/311<2112/3112