Question

12/13•[1/3+1:(1/7+6/7•1/6):7/6]=

Answer 1

   12/13•[1/3+1:(1/7+6/7•1/6):7/6]= 
= 12/13 * [1/3 + 1:(1/7 + 1/7)*6/7] = 
= 12/13 * [1/3 + 1:(2/7)*6/7] = 
= 12/13 * (1/3 + 1*7/2*6/7) = 
= 12/13 * (1/3 + 3) = 
= 12/13 * (1/3 + 9/3) =
= 12/13 * 10/3 = 
= 4/13 * 10 = 
= 40/13

Answer 2

12/13 × [ 1/3 + 1 : ( 1/7 + 1/7):7/6]=
=12/13 × ( 1/3 + 1 × 7/2 × 6/7 ) =
=12/13 × ( 1/3 + 9/3)=
=12/13 × 10/3 =
=(4×10)/13=
= 40 /13=
=3 intregi si 1/13