Алгебра
Английский
Биология
География
Геометрия
История
Русский
Обществознание
Физика
Химия
Информатика
Литература
МатематикаВопрос:
5.26 Раскройте скобки и вычислите:
Ответ:
a) 7,646 - (6,9 – 2,054) = 7,646 - 6,9 + 2,054 = 0,746 + 2,054 = 2,8.
б) 4,17 + (9,182 – 4,17) = 4,17 + 9,182 – 4,17 = 9,182.
в) 4/9 + (1/9 - 2/3) = 4/9 + 1/9 - 6/9 = 5/9 - 6/9 = -1/9.
г) (3 5/8 + 2 2/13) - (2 7/8 + 1 2/13) = (29/8 + 28/13) - (23/8 + 15/13) = 29/8 + 28/13 - 23/8 - 15/13 = (29/8 - 23/8) + (28/13 - 15/13) = 6/8 + 13/13 = 3/4 + 1 = 7/4 = 1,75.
д) -(3,69 - 6 2/13) - (1,31 - 8 11/13) = -3,69 + 6 2/13 - 1,31 + 8 11/13 = (-3,69 - 1,31) + (6 2/13 + 8 11/13) = -5 + 14 13/13 = -5 + 15 = 10.
е) -(5/8 + 2,43) - (-5,93 - 1/4) = -5/8 - 2,43 + 5,93 + 1/4 = -0,625 - 2,43 + 5,93 + 0,25 = -3,055 + 6,18 = 3,125.
б) 4,17 + (9,182 – 4,17) = 4,17 + 9,182 – 4,17 = 9,182.
в) 4/9 + (1/9 - 2/3) = 4/9 + 1/9 - 6/9 = 5/9 - 6/9 = -1/9.
г) (3 5/8 + 2 2/13) - (2 7/8 + 1 2/13) = (29/8 + 28/13) - (23/8 + 15/13) = 29/8 + 28/13 - 23/8 - 15/13 = (29/8 - 23/8) + (28/13 - 15/13) = 6/8 + 13/13 = 3/4 + 1 = 7/4 = 1,75.
д) -(3,69 - 6 2/13) - (1,31 - 8 11/13) = -3,69 + 6 2/13 - 1,31 + 8 11/13 = (-3,69 - 1,31) + (6 2/13 + 8 11/13) = -5 + 14 13/13 = -5 + 15 = 10.
е) -(5/8 + 2,43) - (-5,93 - 1/4) = -5/8 - 2,43 + 5,93 + 1/4 = -0,625 - 2,43 + 5,93 + 0,25 = -3,055 + 6,18 = 3,125.
Похожие
