Which two numbers add up to three and multiply by one ··Little friends don't understand·········
(1) xy = 1. (2) for the deformation of (1), y = 3-x is introduced into the equation 2x (3-x) = LX & # 178; - 3x + 1 = 0x = (3 + √ 5) / 2, or x = (3 - √ 5) / 2. Therefore, when x = (3 + √ 5) / 2, y = (3 - √ 5) / 2 is obtained by introducing it into equation 1, and when x = (3 - √ 5) / 2, y = (3 - √ 5) / 2 is obtained