Question

已知x平方减y平方等于xy求y/x

Answer 1

x² - y² = xy

x² - xy - y² = 0

两边同时除以 x²得：

1 - y/x - (y/x)² = 0

(y/x)² + y/x - 1 = 0

y/x = (-1 + √5)/2 或 y/x = (-1 - √5)/2