Question

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Answer 1

Răspuns:

a) x/12 = 7/12 × 1/7

x/12 = 1/12 => x = 1

b) 4/25 × 1/4 = x/75

1/25 = x/75 => x = 3

c) 3/8 = 15/2 × 1/(x+1)

3/8 = 15/2(x+1)

6(x+1) = 120 => x+1 = 20 => x = 19

d) (1/5 + 2/9) × 45 = 2x + 1

19/45 × 45 = 2x + 1 => 2x + 1 = 19 => x = 9

e) 2^49(4 - 2 - 1) × 992 = 2^32 × 31 × x

2^49 × 992 = 2^32 × 31 × x

x = 2^17 × 32 = 2^17 × 2^5 = 2^22

f) x^2 = 8 × 18

x^2 = 144 => x = 12