The sum of the numerator and denominator of a fraction is 7 1. If you add 1 to the molecule, the simplest score can be (23/48).

1/4 >(9/40)> 1/5; 5/7 & lt； 9/( 10)& lt； 1

The simplest true fraction with a denominator of 8 is (1/8; 3/8; 5/8; 7/8), their sum is (2)

Multiple choice

b； c； c； c； B