Question

Rezolvare(50p)
Repede!!​

Answer 1

Răspuns:

Explicație pas cu pas:

2.

a = b/10

c = d/10

e = f/10

a + c + e = b/10 + d/10 + f/10 = (b + d + f)/10

(a + c + e)/(b + d + f) = 1/10

_________________

3.

x + y + z = 78000

x/2 = y/6 = z/5 = k

x = 2k

y = 6k

z = 5k

x + y + z = 78000

2k + 6k + 5k = 78000

13k = 78000

k = 78000 : 13 = 6000

x = 12000

y = 36000

z = 30000

_________________________

4.

x + y + z = 24,5

x/1,6 = y/3 = z/5,2 = k

x = 1,6k

y = 3k

z = 5,2k

x + y + z = 1,6k + 3k + 5,2k = 9,8k = 24,5

k = 24,5 : 9,8 = 2,5

x = 1,6*2,5 = 4

y = 3*2,5 = 7,5

z = 5,2*2,5 = 13

______________________

5.

a = 4e

b = 4f

c = 4g

d = 4h

a + b + c + d = 4e + 4f + 4g + 4h = 4(e + f + g + h)

(a + b + c + d)/(e + f + g + h) = 4

10 - (a + b + c + d)/(e + f + g + h) = 10 - 4 = 6