Question

Urgenta!!!!! Va rog! Dau coroanaaa!​

Answer 1

Răspuns:

Explicație pas cu pas:

8a)

x/y = 3/4

x = 3y/4

2x + 3y = 3y/2 + 3y = 3y/2 + 6y/2 = 9y/2

4x + y = 3y + y = 4y

raspuns: (9y/2)/4y = 9/8

__________

b)

x/y = 7/9

x = 7y/9

x + 2y = 7y/9 + 2y = 7y/9 + 18y/9 = 25y/9

3x + y = 7y/3 + y = 7y/3 + 3y/3 = 10y/3

raspuns (25y/9)/(10y/3) = 25/9*3/10 = 5/6

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c)

x/2 = y/5

x = 2y/5

7x - 2y = 14y/5 - 2y = 14y/5 - 10y/5 = 4y/5

x + 4y = 2y/5 + 4y = 2y/5 + 20y/5 = 22y/5

raspuns (4y/5)/(22y/5) = 4/22 = 2/11

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d)

x/3 = y/11

x = 3y/11

10x - y = 30y/11 - y = 30y/11 - 11y/11 = 19y/11

x + y = 3y/11 + y = 3y/11 + 11y/11 = 14y/11

raspuns (19y/11)/(14y/11) = 19/14

________________________

9a)

x/2 = y/5

x = 2y/5

3x + 4y = 52

6y/5 + 4y = 52

6y/5 + 20y/5 = 52

26y/5 = 52

y = 52*5/26 = 10

x = 2*10/5 = 4