Question

Ajutati-ma la problema 4! Dau coroana si 98 puncte.

Answer 1

Răspuns:

Explicație pas cu pas:

a)

0,(3) = 3/9 = 1/3

0,(6) = 6/9 = 2/3

x/(1/3) = k sau 3x = k sau x = k/3

y/(1/4) = k sau 4y = k sau y = k/4

z/(2/3) = k sau 3z/2 = k sau z = 2k/3

2x + 3y - z = 66

2k/3 + 3k/4 - 2k/3 = 66

3k/4 = 66

k= 4*66/3 = 88

x = 88/3 m

y = 88/4 = 22 m

z = 2*88/3 = 176/3 m

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b)

P = x + y + z = 88/3 + 22 + 176/3 = 264/3 + 22 = 88 + 22 = 110 m

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c)

35% mamifere

20% insecte

pasari = 100% - (35% + 20%) = 100% - 55% = 45%

35*100/20 = 175% (mamifere in raport cu insectele)

pasari = 63

63*100/45 = 140 exponate

20*140/100 = 28 insecte