. 2x + 3x-6

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• 1. (3x + 2) ^ 2 = 16 find the value of X. 1 | 2 (2x-1) ^ 3 = - 4 find the value of X
• 2. Find the value of X: (3x + 2) &# 178; = 16 1 / 2 (2x-1) &# 179; = - 4
• 3. Calculation: (2x ^ 2) ^ 2 + (- 3x) ^ 3 · (- 2x)
• 4. (40-3x) (30-2x) = 198 * 2
• 5. How to solve 5 / 3x-3 = 3-3 / 2x
• 6. How to solve 3x-5 times 2x of 3 = - 1
• 7. Given the function f (x) = x ^ 3-x decreasing on (0, a) and increasing on [a, positive infinity), try to find the value of A
• 8. Given the function f (x) = − 14x4 + 23x3 + AX2 − 2x − 2, it decreases monotonically in the interval [- 1,1] and increases monotonically in the interval [1,2]. Find the value of real number a
• 9. What is the product of infinitesimal and infinitesimal? Such as the title
• 10. Infinitesimal in limit problems of higher numbers In the limit of higher numbers, the definition of infinitesimal is f (x) when x approaches to x0 or when the limit is zero, then f (x) is called the infinitesimal of X in this process. However, in the related proof later, it seems that the definition of infinitesimal when x approaches to x0 appears again. By definition, isn't infinitesimal only a function? Why can it be replaced by a specific symbol (constant?)? Thank you~
• 11. The process of solving LIM (x → 0) Tan (2x ^ 2) / 1-cosx
• 12. Cosx + cos2x = 0, the value of X
• 13. How to prove the equivalence of 2 / 3 (cosx-cos2x) ~ x (x → 0)
• 14. What is the infinitesimal order of x ^ 1 / 3 + x ^ 4 / 3, x ^ 1 / 2 and 1-cos x ^ 2 when the ball x approaches 0?
• 15. Given that the function f (x) is continuous on (- ∞, + ∞) and satisfies ∫ (0, x) f (x-u) e ^ UDU = SiNx, X ∈ (- ∞, + ∞), find f (x)
• 16. High number problem: when x tends to 0, if the formula of X contains 1 / x, can't we use the formula of equivalent infinitesimal? When x tends to 0, if the expression of X contains 1 / x, can we not use the formula of equivalent infinitesimal? When x tends to infinity, if the expression of X contains 1 / x, can we use the formula of equivalent infinitesimal? For example, e ^ [(1 / (x (x-1))] - 1
• 17. My freshman year. Our senior math teacher said that the infinitesimal substitution rule is not suitable for addition and subtraction, but I see that some problems also use the substitution rule? How do you understand the teacher's words? Under what circumstances does the infinitesimal substitution rule not apply? Can you give examples, thank you! If you are satisfied, there is an addition
• 18. Why can higher order infinitesimal be omitted
• 19. Can high order infinitesimal do four operations?
• 20. Can f (x) = g (x) + O (x) (higher order infinitesimal) be discarded in calculation? Another is the formula of Taylor series. As long as there is a point x0 in the interval (a, b) with n-order derivative, it can be transformed into the form of Taylor series. Does the whole interval (a, b) have n-order derivative? The content of this picture is very little, which is hard to understand, The problem I encountered is whether the higher order infinity of F (x) - f (x0) = the second derivative of F (x0) * (x-x0) ^ 2 + O ((x-x0) ^ 2) can be omitted Let me comment: