Find the derivative of (1) y = 2 ^ - x E ^ - x (2) y = x ^ 3 ln 1 / X

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• 1. 4. If z = ln (Y / x), then the value of the partial derivative of the function Z (x, y) at (1,2) is () A：0 B：1/2 C：1 D：-1/2
• 2. Let z = Z (x, y) be an implicit function determined by the equation f (x-z, Y-Z), where f (U, V) has a continuous partial derivative of the first order
• 3. Second order partial derivative of multivariate implicit function
• 4. The problem of partial derivative of higher number Z = (1 + XY) ^ y, how to find the partial derivative of Y?
• 5. Let the function z = f (x, y) be determined by the equation XY + YZ + XZ = 1, and find ᦉ 8706; 2Z / ᦉ 8706; (x ^ 2)
• 6. Let z = e ^ (x-2y), and x = Sint, y = T ^ 3, find DZ / dt
• 7. Z = e (x-2y) x = Sint y is equal to the square of t to find DZ / DT
• 8. Let u = f (x, z) and Z (x, y) be a function determined by the equation z = x YP (z)
• 9. What does it mean to have a definition in a function of higher numbers?
• 10. Define Max {a, B} = {B, AB}, then the range of F (x) = max {2 ^ x, 2 ^ - x} is?
• 11. Finding the second order partial derivative of a function: z = ln (e ^ x + e ^ y)? When finding the first order derivative of X, why does the answer e ^ x become When we get the first derivative of X, why does the answer e ^ x become a molecule?
• 12. X / 3 + Y / 4 + Z / 5 = 1 / 3 find (XY + XZ + YZ) / (x ^ 2 + y ^ 2 + Z ^ 2)= How much is it
• 13. Given X / 2 = Y / 3 = Z / 4 and XY YZ + XZ = 2, find (x ^ 5 + y ^ 5) (x ^ 5-y ^ 5) + (y ^ 5 + Z ^ 5) (y ^ 5-Z ^ 5) + (Z ^ 5) ^ 2 What do you find from the reduction of algebraic expressions?
• 14. Given the function f (x) = ax-x & # 178; - LNX, a ∈ R, let the maximum value of F (x) be m and the minimum value be m. if M + m > 5-ln1 / 2, the value of a is obtained
• 15. The maximum of function f (x) = (a + LNX) / X (a ∈ R) is equal to? The function f (x) = (a + LNX) / X (a ∈ R) is known, (1) How to find the extremum of function f (x)? (2) If a > 1, prove that there exists x0 belonging to (0, + infinity), such that f (x0) > A? thank you
• 16. Let f (x) = 2x + LNX & nbsp;, then & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; () A. X = 12 is the maximum of F (x), B. x = 12 is the minimum of F (x), C. x = 2 is the maximum of & nbsp; f (x), D. x = 2 is the minimum of & nbsp; f (x)
• 17. The image of function y = (x-1) / LNX
• 18. This paper discusses the number of intersections between the image and the line y = k of the function FX = LNX / X & # X belongs to [1 / E, e] emergency
• 19. Given that the function z = Z (x, y) is determined by the equation x ^ 2 + y ^ 2 + Z ^ 2 = 2RZ, find DZ Please give the solution process, thank you
• 20. Finding the extremum of function y = (1 + 2x) e ^ x That's - 3 / 2