Ответ:

Пошаговое объяснение:

a) -(-y - 16) + 4(2y - 3) = y + 16 + 8y - 12 = 9y + 4

б) 5(a - 2b) + 3(-a + 3b) = 5a - 10b - 3a + 9b = 2a - b

в) 4(m + 5n) - 5(m - 3n) = 4m + 20n - 5m + 15n = -m + 35n

г) -b(1 + x) + b(1 - x) = -b - bx + b - bx = -2bx

д) 1,6(2p - k) - 0,8(4p - 5k) = 3,2p - 1,6k - 3,2p + 4k = 2,5k

e) -0,2(5c + 3d) - 0,5(-4c + 0,8d) = -c - 0,6d + 2c - 0,4d = c - d

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a)

9 - 4y = -5y

5y - 4y = -9

y = -9

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б)

12a - 1 = -a + 25

12a + a = 25 + 1

13a = 26

a = 26 : 13

a = 2

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в)

8 + 3b = -7 - 2b

3b + 2b = -7 - 8

5b = -15

b = -15 : 5

b = -3

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a)

2a - (14 - 3a) = -10

2a - 14 + 3a = -10

5a - 14 = -10

5a = 14 - 10

5a = 4

a = 4 : 5

a = 0,8

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б)

(9 - 2b) - (b + 5) = 16

9 - 2b - b - 5 = 16

4 - 3b = 16

3b = 4 - 16

3b = -12

b = -12 : 3

b = -4

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в)

-(4c - 7) = 5c + (11 - 7c)

-4c + 7 = 5c + 11 - 7c

-4c + 7 = -2c + 11

4c - 2c = 7 - 11

2c = -4

c = -4 : 2

c = -2

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