Question

Найти значение выражение при x=-4/5
(1+x+1/1-x) : ( 1+ 1/1-x^2)

Answer 1

(1+x+1/1-x) : (1+1/1-x²) = (1/1 - 4/5 +1/1 + 4/5) : (1/1 + 1/1 - (-4/5) ²) = (5/5 - 4/5 + 5/5 + 4/5) : (25/25 + 25/25 - 16/25) = 2 : 34/25 = 2 * 25/34 = 25/16 = 1 9/16.