Question

Найдите значение выражения: А) 3,1a - 0,3a - 4,8a = B) 4,5b - 5c - (5,5b - 5c) = C) 3,8a - 1,2b - ( 1,1b + 3,8a) = D) 1,8a - (1,8a - 1,05c) - (1,05c - 0,9a) = E) - (5,6c - 4,1b) - (4,1b - 5,6c) =

Answer 1

Ответ:

3,1a - 0,3a - 4,8a = -2а

B)4,5b - 5c - (5,5b - 5c) = -b

C)3,8a - 1,2b - ( 1,1b + 3,8a) =-2.3b

D)1,8a - (1,8a - 1,05c) - (1,05c - 0,9a) = 0.9a

E)- (5,6c - 4,1b) - (4,1b - 5,6c) = 0

Пошаговое объяснение:

3,1a - 0,3a - 4,8a = -2а

B)4,5b - 5c - (5,5b - 5c) = -b

C)3,8a - 1,2b - ( 1,1b + 3,8a) =-2.3b

D)1,8a - (1,8a - 1,05c) - (1,05c - 0,9a) = 0.9a

E)- (5,6c - 4,1b) - (4,1b - 5,6c) = 0

Answer 2

Давайте поочередно рассчитаем значения данных выражений:

А) 3.1a - 0.3a - 4.8a = (3.1 - 0.3 - 4.8)a = -1.0a

B) 4.5b - 5c - (5.5b - 5c) = 4.5b - 5c - 5.5b + 5c = (4.5b - 5.5b) + (-5c + 5c) = -1.0b + 0 = -1.0b

C) 3.8a - 1.2b - (1.1b + 3.8a) = 3.8a - 1.2b - 1.1b - 3.8a = (3.8a - 3.8a) + (-1.2b - 1.1b) = 0 - 2.3b = -2.3b

D) 1.8a - (1.8a - 1.05c) - (1.05c - 0.9a) = 1.8a - 1.8a + 1.05c - 1.05c + 0.9a = (1.8a - 1.8a + 0.9a) + (1.05c - 1.05c) = 0.9a + 0 = 0.9a

E) - (5.6c - 4.1b) - (4.1b - 5.6c) = -5.6c + 4.1b + 4.1b - 5.6c = (-5.6c - 5.6c) + (4.1b + 4.1b) = -11.2c + 8.2b

Итак, значения выражений: А) -1.0a B) -1.0b C) -2.3b D) 0.9a E) -11.2c + 8.2b