Question

Determinati x din proportiile : a) 3/x = 21/35 b) 5/2x-1 = 30/42

Answer 1

Răspuns:

a)

3/x = 21/35

3 * 35 = 21x

105 = 21x

x=105 / 21

x=5

b )

5/2x-1 = 30/42

210 = 60x - 30

60x = 240

x=240 / 60

x=4