If the equation x-3x-a = 0 has exactly two real roots, then the value of real number a is Don't copy the problem-solving process from Baidu to me

If the equation x-3x-a = 0 has exactly two real roots, then the value of real number a is Don't copy the problem-solving process from Baidu to me

There are two real roots in this paper. Let f (x) = 3-3-3-3-3-3-3-3-3-3-3-3-3-x-a-a & nbsp; there are two zeros in this paper, and there are two zeros in this paper. F & \; (x) = 3 x ^ 2-3-3-3-3-3-3-3-3-3-3-3x-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3x-3x-3-3x-3-a-3x-3-3x-a-3-3x-3-3x-a-3-3x-3x-a-3x-a-3-3-3-a-3x-3x-3-3-3x-a-a-3x-a-a-3-3-3-3-3-a-3-3-3 6x & nbsp; & nbsp; & nbsp; & nbsp; F & # 39; &# 39; (1) = 6 & gt; 0 is the minimum & nbsp; & nbsp; &The maximum value of the maximum value is the maximum value of the maximum value, so the drawing: only when the x = 1 & nbsp; f (x) is the maximum value of the maximum value, the maximum value is the maximum value, so the drawing: only when x = 1 & amp; nbsp; f (x) is the maximum value of the maximum value, so the drawing: only when x = 1 & nbsp; 1 & nbsp; f (x (x (x) is the maximum value of the maximum value, so the drawing: only when x = 1 & nbsp; 1 & nbsp; 1 & nbsp; 1 & nbsp; f (1 & nbsp; f (f (1) is the maximum value of the two points of the two points of intersection, namely: the two points of the two points of two points, namely: as: as: F (1 (1) (f (1) = x ^ 3-3-3-3-3-3x3-3-3x-3x-3x-3-3x-3-3x-3-3-3x-a = 2-2-2-nbsp; or & nbsp; a = - 2

The equation (x-a) (X-8) - 1 = 0 has two real roots. Find the value of integer a

x²-(a+8)x+8a-1=0
If there are two real roots, the discriminant is greater than 0
[-(a+8)]²-4(8a-1)>0
a²+16a+64-32a+4>0
a²-16a+64+4>0
(a-8)²+4>0
equation holds good under all circumstances
So a takes any integer

Is there a big gap between molecules in water vapor or ice
The molecular spacing of water is smaller than that of ice, so how does the molecular spacing of water change?

The density of liquid is higher than that of solid than that of gas
The molecular spacing is opposite

What is the physical acceleration expression?

The acceleration is equal to the resultant force on the body divided by the mass of the body: a = f / m. therefore, the acceleration is directly proportional to the force and inversely proportional to the mass of the body. When the force is fixed, the greater the mass, the smaller the acceleration of the body. We also say that the inertia of the solid is large
In motion, acceleration represents the increase of velocity per second. V end = V beginning + a T

A math problem
R=100e^-0.0004279t t=10000
Find the value of R

Even if R is logarithmic, you have to restore R, and the final result is still this. Use a calculator to calculate the value of R

41 + 40 + 39 + 38 +. + 4 + 3 + 2 + 1 in a simple way, how to calculate

41+40+39+38+.+4+3+2+1
=(41+1)×41÷2
=42×41÷2
=861
Make use of the characteristic that the first and last two numbers add up and are equal, carry on the operation

What is the product of an odd number and an even number? What is the product of multiplication of two different odd numbers?

The product of an odd number and an even number must be even
The product of multiplication of two different odd numbers is odd

1024+512+256+.+2+1+2/1+4/1+8/1+.512/1+1024/1

1. Obviously, it is the sum of equal ratio sequence: SN = A1 (1-Q ^ n) / (1-Q) (q is not equal to 0) 2, is there any mistake in this question? It should be 1024 + 512 + 256 +. + 2 + 1 + 1 / 2 + 1 / 4 + 1 / 8 +. 1 / 512 + 1 / 1024 = 2 ^ - 10 * (1-2 ^ 21) / (1-2) ≈ 20483, the original question = 2 * (2 ^ 10 + 2 ^ 9 +... + 2 ^ 1) + 2 ^ 0 = 2 * (2 * (1-2 ^ 10) / (1-2)) + 1

How many positive integers larger than 12000 can be composed of numbers 1, 2, 3, 4 and 5?

A positive integer larger than 12000,
Because 12345 is the smallest of the five bits of 1,2,3,4,5
There are 5 * 4 * 3 * 2 * 1 = 120 positive integers larger than 12000

A squared + A-3 = 0 a quartic + 2A cubic-a-1=
tell me please 3q

a^2+a-3=0
a^2+a=3
a^4+2a^3-a-1
=a^2*(a^2+a)+a^3-a-1
=a^3+3a^2-a-1
=a*(a^2+a)+2a^2-a-1
=2a^2+2a-1
=2(a^2+a)-1
=5