Răspuns:
Explicație pas cu pas:
12/91*[1/3 + 1 : (1/7 + 6/7*1/6) : 7/6] + 6/13*[1/4 + (7/36 - 1/24) : 7/6]
= 12/91*[1/3 + 1 : (1/7 + 1/7) : 7/6] + 6/13*[1/4 + (14/72 - 3/72) : 7/6]
= 12/91*(1/3 + 1 : 2/7 : 7/6) + 6/13*(1/4 + 11/72 : 7/6)
= 12/91*(1/3 + 7/2 : 7/6) + 6/13*(1/4 + 11/72*6/7)
= 12/91*(1/3 + 7/2*6/7) + 6/13*(1/4 + 11/84)
= 12/91*(1/3 + 3) + 6/13*(41/84 + 11/84)
= 12/91*10/3 + 6/13*52/84
= 40/91 + 2/7
= 40/91 + 26/91
= 66/91
