0,7 = 7/10
5/6 -0,7 -5/42 -0,7 -1/3 -0,7- <span>4/7 -0,7 =
</span>5/6 - 7/10 - 5/42 - 7/10 - 1/3 - 7/10 - 4/7 - 7/10 =
5/6 - 5/42 - 1/3 - 4/7 - 7/10 - 7/10 - 7/10 - 7/10 =
35/42 - 5/42 - 7/21 - 12/21 - 28/10 =
30/42 - 19/21 - 28/10 =
15/21 - 19/21 - 14/5 =
-4/21 - 14/5 =
-20/105 - 294/105 =
-314/105
60 % = 60 книг
25 % = 25 книг худ ,лит-ра
15 словари
25 +15 =40 книг
60 -40 =20 ( больше ) учебников