Question

1 Determinați x din proporţia
DAU COROANA

Answer 1

2 1/3 = (2x3+1)/3 = 7/3

0,5 = 5/10 = 1/2

1 3/7 = (1x7+3)/7 = 10/7

7/3 / x = 1/2 / 10/7

7/(3x) = 1/2 x 7/10

7/(3x) = 7/20

7x3x = 7x20

21x = 140

x = 140/21

x = 20/3