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If the equation x ^ 2 + (m-1) x + 1 = 0 has a solution in the interval [0,2], find the value range of M
Convert expression to
x^2+(m-1)x+1=0
==>m=-x-1/x+1=-(x+1/x)+1 （0
X * (x + 1) * (x + 2) * (x + 3) = 1680 x = 5 (the process of this equation)
X (x + 1) (x + 2) (x + 3) = 1680 [x (x + 3)] [(x + 1) (x + 2)] = 1680 (X & sup2; + 3x) (X & sup2; + 3x + 2) = 1680 (X & sup2; + 3x) & sup2; + 2 (X & sup2; + 3x) - 1680 = 0, let t = x & sup2; + 3xt & sup2; + 2t-1680 = 0, t = 40 or T = - 42x & sup2; + 3x = 40 or X & sup2; + 3x = - 42x & sup2; + 3
Equation (5 / 2) × 2-10 (3-x) = - 8 now,
(5/2)×2-10（3-x）=-8
5-30+10x=-8
10x=-8+30-5
10x=17
x=17/10
x=1.7
The number of solutions of the equation SiNx * π = x / 4
Transcending inequality and drawing solutions
There are seven solutions
The number of solutions of the equation SiNx = x / π is
Three, can be used to solve the problem, respectively draw y = x and y = π SiNx image, see the number of their intersection to know!
What is the number of solutions to the equation x / 9 = SiNx?
7
Use examples or descriptions to represent the following sets
1. The set of dependent variables of quadratic function y = x2-4
2. Set of independent variables of inverse scale function y = 2 / X
3. The set of inequality 3x ≥ 4-2x
﹛y|y=x²-4﹜
﹛x|y=2/x﹜
﹛x|3x≥4-2x﹜
If the length of one edge is a and the other edges are all 1, the value of a is ()
If the length of a pyramid is 1, and only one edge is uncertain, then the base of the pyramid has been determined, which only depends on the height of the pyramid. If one surface of the pyramid is perpendicular to the base, the volume is the largest, then the height of the pyramid is two thirds root sign 3, and the length a is two thirds root sign 6
It is known that the perimeter of the straight section (the section perpendicular to the side edge) of the oblique prism is 8, the height is 4, and the angle between the side edge and the bottom is 60 degrees. What is the side area of the side prism
Why?
Is it 8 divided by root 3?
I count it on four sided sticks
Because the section is perpendicular to the edge, the section of the surface on the side is also perpendicular to the edge
So the sum of the four sections is 8
Height is the height of the whole column, and then use that 60 degrees
Don't you count it as coming out
In the arithmetic sequence {an}, a1 + 3A8 + A15 = 120, then the value of 2a9-a10 is ()
A. 20B. 22C. 24D. -8
∵ in the arithmetic sequence {an}, a1 + 3A8 + A15 = 120, ∵ 5a8 = 120, ∵ A8 = 24, 2a9-a10 = a1 + 7d = A8 = 24, so C is selected
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