Question

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Answer 1

Răspuns:

Explicație pas cu pas:

a)

(0,2 + 7/9) : 11/15 + [0,1(6) - 1/2]

0,2 = 2/10 = 1/5

0,1(6) = (16 - 1)/90 = 15/90 = 1/6

(1/5 + 7/9) : 11/15 + (1/6 - 1/2) = (9/45 + 35/45) : 11/15 + (1/6 - 3/6)

= 44/45 : 11/15 + (-2/6)

= 44/45 *15/11 + (-1/3)

= 4/3 - 1/3 = 3/3 = 1

2*1 = 2

2 oua de aur sunt in posesia unui colectionar

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b)

x/11 = y/6 = z/7 = k

x = 11k

y = 6k

z = 7k

2x + 3y = 80

2*11k + 3*6k = 80

22k + 18k = 80

40k = 80

k = 80 : 40 = 2

x = 11*2 = 22

y = 6*2 = 12

z = 7*2 = 14

x - y = 22 - 12 = 10

z - 2 = 14 - 2 = 12