Будем решать этот пример по частям:
1) 0,5 + (3 - 2/3)/7 = 1/2 + (9/3 - 2/3)/7 = 1/2 + (7/3)/7 = 1/2 + 1/3 = 3/6 + 2/6 = 5/6
2) 0,75 - 2/3 = 3/4 - 2/3 = 9/12 - 8/12 = 1/12
3) (5/6)/(1/12) = 5*12/6 = 10
4) 3 + (2 - 1/3)/5 = 3 + (6/3-1/3)/5 = 3 + (5/3)/5 = 3 + 1/3 = 9/3 + 1/3 = 10/3
5) 1,25 - 5/6 = 1 1/4 - 5/6 = 5/4 - 5/6 = 15/12 - 10/12 = 5/12
6) (10/3)/(5/12) = 10*12/3*5 = 8
7) 10 - 8 = 2
Ответ B.
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Будем решать этот пример по частям:
1) 0,5 + (3 - 2/3)/7 = 1/2 + (9/3 - 2/3)/7 = 1/2 + (7/3)/7 = 1/2 + 1/3 = 3/6 + 2/6 = 5/6
2) 0,75 - 2/3 = 3/4 - 2/3 = 9/12 - 8/12 = 1/12
3) (5/6)/(1/12) = 5*12/6 = 10
4) 3 + (2 - 1/3)/5 = 3 + (6/3-1/3)/5 = 3 + (5/3)/5 = 3 + 1/3 = 9/3 + 1/3 = 10/3
5) 1,25 - 5/6 = 1 1/4 - 5/6 = 5/4 - 5/6 = 15/12 - 10/12 = 5/12
6) (10/3)/(5/12) = 10*12/3*5 = 8
7) 10 - 8 = 2
Ответ B.