Verified answer

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Пошаговое объяснение:

1/2а + 2/3а = 5

3/6а + 4/6а = 5

7/6а = 5

а = 5 : 7/6

а = 5 * 6/7

а = 30/7

а = 4 2/7

1/2в + 2/5в - 7/10в = 4/5

5/10в + 4/10в - 7/10в = 4/5

2/10в = 4/5

в = 4/5 : 2/10

в = 4/5 * 10/2

в = 40/10

в = 4

(3у + 4)/8 + (2у + 5)/2 = 1 | * 8

(3у + 4) + 4(2у + 5) = 8

3у + 4 + 8у + 20 = 8

11у + 24 = 8

11у = 8 - 24

11у = -16

у = -16 : 11

у = -16/11

у = -1 5/11

3/4z + 3,2 = 2/5z + 2,5

3/4z - 2/5z = 2,5 - 3,2

15/20z - 8/20z = -0,7

7/20z = -7/10

z = -7/10 : 7/20

z = -7/10 * 20/7

z = -1/1 * 2/1

z = -2/1

z = -2