Question

va rog

problema 20 repede​

Answer 1

Răspuns:

Explicație pas cu pas:

a) x/10 = 4/5 => x = 40/5 => x = 8

8/10⁽² = 4/5

b) 16/x = 4/5 => 4x = 5·16 => x = 5·16/4 = 5·4 => x = 20

16/20⁽⁴ = 4/5

c) (x+1)/15 = 4/5  => 5(x+1) = 4·15  =>

x+1 = 4·15/5 = 4·3 = 12 => x = 12-1 => x = 11

12/15⁽³=4/5

d) 16/(2x+2) = 4/5 => 4(2x+2) = 16·5 =>

4·2·(x+1) = 16·5  => x+1 = 16·5/8 = 2·5 = 10 =>

x = 10-1 => x = 9  ; 16/20⁽⁴ = 4/5

e) 12/(3x+3) = 4/5 => 4·3(x+1) = 12·5  I: 12 =>

x+1 = 5  => x = 5-1 => x = 4

12/15⁽³ = 4/5

f) 24/(x+2) = 4/5 => 4(x+2) = 24·5  I:4 =>

x+2 = 6·5 = 30 => x = 30-2 => x = 28

24/30⁽⁶ = 4/5