Question

3. Упростите выражения.
1)7,5a-6,8b-7,5a-6,8b
3) 2,1a-1,7c + 2,7a - 2,2c
5) 4,2а + 1,8b - 2,6а +3,4а
2) a- 3a +4,7 - 7,2
4) -9,8c + 5,1d+ 1,1c +4,2d+4c
6) -8,9а + 1,5b - 1,la - 5,5b

Answer 1

Ответ:

1) 7,5a - 6,8b - 7,5a - 6,8b = (7,5a - 7,5a) + (-6,8b - 6,8b) = 0a + (-13,6b) = -13,6b

2) a - 3a + 4,7 - 7,2 = a - 3a - 2,5 = -2a - 2,5

3) 2,1a - 1,7c + 2,7a - 2,2c = 4,8a - 3,9c

4) -9,8c + 5,1d + 1,1c + 4,2d + 4c = (-9,8c + 1,1c + 4c) + (5,1d + 4,2d) = -4,7c + 9,3d

5) 4,2a + 1,8b - 2,6a + 3,4a = (4,2a - 2,6a + 3,4a) + 1,8b = 5,0a + 1,8b

6) -8,9a + 1,5b - 1,1a - 5,5b = (-8,9a - 1,1a) + (1,5b - 5,5b) = -10,0a - 4,0b

Answer 2

Ответ: 1) 7,5a - 6,8b - 7,5a - 6,8b = (7,5a - 7,5a) + (-6,8b - 6,8b) = 0 - 13,6b = -13,6b

2) a - 3a + 4,7 - 7,2 = (a - 3a) + (4,7 - 7,2) = -2a - 2,5

3) 2,1a - 1,7c + 2,7a - 2,2c = (2,1a + 2,7a) + (-1,7c - 2,2c) = 4,8a - 3,9c

4) -9,8c + 5,1d + 1,1c + 4,2d + 4c = (-9,8c + 1,1c + 4c) + (5,1d + 4,2d) = -4,7c + 9,3d

5) 4,2a + 1,8b - 2,6a + 3,4a = (4,2a - 2,6a + 3,4a) + 1,8b = 5a + 1,8b

6) -8,9a + 1,5b - 1,1a - 5,5b = (-8,9a - 1,1a) + (1,5b - 5,5b) = -10a - 4b

Объяснение: