Some derivative problems of mathematical function in Senior Two (1) The monotone interval of y = 1 / (x + 1) is determined by derivative (2) F (x) = (x ^ 2-3 / 2x) e ^ x increasing function interval

Some derivative problems of mathematical function in Senior Two (1) The monotone interval of y = 1 / (x + 1) is determined by derivative (2) F (x) = (x ^ 2-3 / 2x) e ^ x increasing function interval

(1) The derivative of y = 1 / (x + 1) is y '= - 1 / (x + 1) ^ 2, because its derivative is always less than 0, so the original function is in its interval, that is, when x is not equal to - 1; the original function monotonically decreases (2) because the derivative of the original function is y' = x ^ 2 * e ^ x + 2x * e ^ x-3 * e ^ X / 2x + 3 * e ^ X / 2x ^ 2, which requires the increasing interval of the original function, that is, the larger derivative function