If x and y are defined as double variables, what is the value of the expression x = 1, y = x + 3 / 2 Want to be more detailed. Is the value 2.0 or 2.000000

If x and y are defined as double variables, what is the value of the expression x = 1, y = x + 3 / 2 Want to be more detailed. Is the value 2.0 or 2.000000

y = x + 3/2 = 1.0 + 1 = 2.0 = 2.000000
2.0 or 2.0 million is the same

How to solve the equation 54-x = (24-x) / 2 / 5

The original equation can be reduced to, from the meaning of the problem
54-x=（24-x）*(5/2)
54-x=60-(5/2)x
-x+(5/2)x=60-54
(3/2)x=6
x=4

If the line 3x-4y-24 = 0 intersects the x-axis and y-axis in the linear coordinate system at two points a and B respectively, then the area of △ abo (o is the origin of rectangular coordinates) is

8*6*1/2=24

Let the sum of the first n terms of sequence {an} be SN. For all n ∈ n +, the point (n, Sn / N) is on the image of function f (x) = 3x + 2
(1) Find the general formula of A1, A2 and sequence {an}; (2) join the inequality f (n) ≥ sn-22

(1) ∵ points (n, Sn / N) are all on the image of function f (x) = 3x + 2
∴Sn/n=3n+2
∴Sn=3n²+2n
When n = 1, A1 = S1 = 3 + 2 = 5
When n = 2, S2 = 5 + A2 = 3 × 4 + 2 × 2 = 16, A2 = 11
When n ≥ 2, s (n-1) = 3 (n-1) & # 178; + 2 (n-1) = 3N & # 178; - 4N + 1
∴an=Sn-S(n-1)=6n-1
When n = 1, A1 = 6-1 = 5
∴an=6n-1
(2)Sn=6×n(n+1)/2-1=3n²+3n-1
∴f(n)≥Sn-22
∴3n+2-(3n²+3n-1)+22≥0
∴-3n²+25≥0
∴n²≤25/3
∴1≤n≤√(25/3)
∵√4＜√(25/3)＜√9
∴1≤n≤2
{1,2} is the solution set of the original inequality
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Under the action of external force, a point charge with a negative power of + 2x10 moves from point a to point B,
In this process, the work done by the electric field force on the point charge is to the negative sixth power of 8 times 10. If the potential of point a is φ A and the potential of point B is φ B, then the following conclusions are correct: 1. It can be determined that φ a - φ B = 400V 2. It can be determined that φ a - φ B = - 400V 3. It may be equal to 0 4

Your answer is "the work of [external force] on point charge is 8 × 10 ^ - 6J." or "the work of [electric field force] on point charge is 8 × 10 ^ - 6J."
If it is an external force, CD is chosen; if it is an electric field force, a is chosen

For the function f (x) = (AX + 1) / (x-1) (a is a real number, X is not equal to 1), when a = 2, the condition 2 < X1 < X2 is satisfied,
There are always f (x1) - f (x2) < 3 (x2-x1). Is this proposition correct? Derivative solution is required
(1) When a = 2, f (x) = 2 + 3 / X-1, then f '(x) = - 3 / (x-1) square; (2) when x > 2, f' (x) ＜ - 3, (3) can get 2 ＜ x1 ＜ X2, [f (x1) - f (x2)] / x1-x2 ＜ - 3, that is, f (x1) - f (x2) ＜ 3 (x2-x1), so the proposition is correct
Who can explain why in the second step, when x > 2, f '(x) ＜ - 3 and the third step [f (x1) - f (x2)] / x1-x2 ＜ - 3

There is a mistake

Fill - 1, + 2, - 3, + 4, - 5, + 6, - 7, + 8, - 9 in the grid of the right graph, so that the three numbers on each row, column and diagonal satisfy the following two conditions: (1) the product of the three numbers is negative; (2) the sum of the absolute values of the three numbers is equal

As shown in the figure: the answer to this question is not unique

The known function f (x) = {- x ^ 2 + (1 / 2) x, X

In this paper, the two cases of functions are derived, and let the derivative function be 0, then the two values of X are obtained, X1 = 1 / 4-K / 2, X2 = (1 / k) - 1
f(x1)f(x2)＜0
The solution is: K ∈ (- ∞, 1 / 2) ∪ (1 / 2,1)

If the absolute value of (K + 1) x ^ k + 1 - (K-2) x-3 = 0 is a linear equation with one variable, find the root

(K + 1) x \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\it's not easy

Inverse function of 2 ^ x + 4x = y

The inverse function of this function may not have an explicit function and can't be solved. We can only prove the existence of its inverse function by the existence theorem of inverse function