(1*2*3*4*5*6+6*7*8*9*10*11)/(1*2*3*4*5*6)
=1*2*3*4*5*6/(1*2*3*4*5*6) + 6*7*8*9*10*11/(1*2*3*4*5*6)
=1+(6*7*2*4*3*3*2*5*11)/(1*2*3*4*5*6)
(1*2*3*4*5*6+6*7*8*9*10*11)/(1*2*3*4*5*6)
=1*2*3*4*5*6/(1*2*3*4*5*6) + 6*7*8*9*10*11/(1*2*3*4*5*6)
=1+(6*7*2*4*3*3*2*5*11)/(1*2*3*4*5*6)