Question

3/5+6/7+5/6+7/12+9/20+11/30+13/42=小学奥数,

Answer 1

3/5+6/7+5/6+7/12+9/20+11/30+13/42

=3/5+6/7+5/6+1/3+1/4+1/4+1/5+1/5+1/6+1/6+1/7

=(3/5+1/5+1/5)+(6/7+1/7)+(5/6+1/6+1/6+1/3)+(1/4+1/4)

=1+1+1+1/2+1/2

=3+1

=4