Question

lg(x-1)+lg (x-5/2)=1

Answer 1

lg(x - 1)(x - 2,5) = 1
(x-1)(x-2,5)=10; х> 2,5
x² - 3,5x + 2,5 = 10
x² - 3,5x - 7,5 = 0
x1 = 5; x2 = -1,5( не удовлетворяет х>2,5