Question

cat face?
cat este rezultatul la aceasta fractie

Answer 1

a/b=6/7=>7a=6b=>a=6b/7
(b-a)/(b+a)=?
(b-6b/7)/(b+6b/7)=(7b/7-6b/7)/(7b/7+6b/7)=(b/7)/(13b/7)=(b/7)*(7/13b)=
7b/91b=7/91=1/13

Answer 2

a/b=6/7; 7a=6b; a=6b/7

b-a              b-6b/7             b/7
--------=--------------------= ----------= b/7*7/13b=1/13
b+a              b+6b/7          13b/7