The distance from a point P on the ellipse x ^ 2 / 25 + y ^ 2 / 9 = 1 to the focus F1 is 2, O is the origin, q is the midpoint of Pf1, and the length of OQ is calculated

The distance from a point P on the ellipse x ^ 2 / 25 + y ^ 2 / 9 = 1 to the focus F1 is 2, O is the origin, q is the midpoint of Pf1, and the length of OQ is calculated

x^2/25+y^2/9=1
a=5,b=3,c=4
F1(-4,0),F2(4,0)
The distance between the point P on the ellipse x ^ 2 / 25 + y ^ 2 / 9 = 1 and the focus F1 is 2
|PF1|=2,|PF2|=2a-|PF1|=2*5-2=8
|OF1|=|OF2|
O is the origin and Q is the midpoint of Pf1
The length of OQ = | PF2 | / 2 = 8 / 2 = 4

Our sum is 15, prime, I am, our product is 26. Prime, I am? Our sum is 24, prime, I am
The product of the two of us is 119, prime number. What am I?

The sum of us is 15, 7 is prime, I am 8,
Our product is 26.2 prime, I'm 13
The sum of us is 24, 11 prime, I'm 13
Our product is 119, prime 7, I'm 17

Write the minimum value of the function y = x ^ 2 + ax + 3 (- 1 ≤ x ≤ 1) when the constant a satisfies the following conditions: 1.0 < a ＜ 3; 2. > 2 √ 3
Tick 3: root 3, the second question should be marked with one less a, which should be: a ＞ 2 √ 3

y=x²+ax+3=(x+a/2)²+3-a²/4 (-1≤x≤1)
1. When: 0 < a ＜ 3, 0 < A / 2 ＜ 3 / 2 √ 3 > 1
So, - A / 2 ＜ - √ 3

Given that a > 1, b > 0 and B is not equal to 1 and 1 / 2, try to compare the logarithm of a with log base 2 and the logarithm of a with log base 2B
Online and so on, to process ah, detailed point ah
All right
Wrong [log of a with base 2] changed to log of a with base B

Because log is based on B, the logarithm of a = log is based on a, the reciprocal of logarithm of B
Log base 2B logarithm of a = log base a reciprocal logarithm of 2B
When the base a is greater than 1, the logarithm of the function y = log with a as the base x is an increasing function
So when B is greater than 0, 2b is greater than B
So the logarithm of log with a as base 2b is greater than that of log with a as base B
So the logarithm of a with B as the base of log is larger than that with 2b as the base of log
I have made it clear. I hope you will be satisfied

Given that X: Y: z = 3:4:7 and 2x - y + Z = - 18, the value of formula x + 2y-z is obtained

Let x = 3A, y = 4A, z = 7a
Bring in 2x - y + Z = - 18
We get a = 2
So x + 2y-z = 4A = 8

It is known that the probability density function of two-dimensional random variable (x, y) is f (x, y) = AE Λ - (x + y), x > 0, Y > 0, and others
Find 1 constant a 2 edge probability density FX (x) 3 probability p (x > 2Y)

1.a = 1
2.e^(-x) ,-$

How to use exp function in MATLAB

Exp exponential function
exp(2)
in addition
Exp (1) is the constant E = 2.7183

How much is 18 yuan and 8 Jiao
nothing

1800 + 80 = 1880 points

The area of the parallelogram is 0.18dm2 larger than that of the triangle, and the area of the two figures is 0.18dm2 larger than that of the triangle
What's the sum?

0.18×3=0.54dm²

What does h in the vertex formula of quadratic function analysis mean? I need to be more specific!

You mean y = a (X-H) & sup2; + k?
H is the abscissa of the vertex
For example, the vertex is (- 2,4)
Then the vertex formula is y = a (x + 2) & sup2; + 4
If the vertex is (2,4)
Then the vertex formula is y = a (X-2) & sup2; + 4