Question

tìm x:

10,6 : x +7,12 : x = 3

7 : x - 3,9 : x =5

Answer 1

a/ => 10,6 . \(\frac{1}{x}\) + 7,12 . \(\frac{1}{x}\) = 3

=> \(\frac{1}{x}\) .(10,6 + 7,12) = 3

=> \(\frac{1}{x}\) . 17,72 = 3

=> \(\frac{1}{x}\) = \(\frac{75}{443}\)

=> x = \(\frac{443}{75}\)

b/ => 7 . \(\frac{1}{x}\) - 3,9 .\(\frac{1}{x}\) = 5

=> \(\frac{1}{x}.\)(7 - 3,9) = 5

=> \(\frac{1}{x}\) = \(\frac{50}{31}\)

=> x = \(\frac{31}{50}\)