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It is proved that the function g (x) = 2x ^ 2-3x + 1 (x ∈ R) is a decreasing function in the interval (- ∞, 0) Correct answer format, deduction le6 points, a total of 12 points Solutions for senior one
Use derivative to do g (x) = 2x ^ 2-3x + 1, so G '(x) = 4x-3, because x ∈ (- ∞, 0], so G' (x) < 0, so the function is a decreasing function in the interval (- ∞, 0), or G (x) = 2x ^ 2-3x + 1 = (4x + 1) (x-1), so X1 = - 1 / 4x2 = 1, because the opening is upward, so the lowest point is x = 3 / 8, so when x < 3 / 8, the function decreases (...)
A cube box, edge length 10 cm, volume is how many cubic meters?
10 cm = 0.1 M
Volume = 0.1 × 0.1 × 0.1 = 0.001 M3
The function f (x) = 2asin2x-23asinxcosx + A + B, X ∈ [0, π 2], the range of value is [- 5, 1], and the values of a and B are obtained
The function f (x) is the function of F (x) = 2 (x) = 2-2-2-2-2-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-2-2-2-3-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2-2 it's not easy; When a < 0, a = - 2, B = 1
If the absolute value of a = 2, B = - 7, and the opposite number of C is - 5, find the sum of a + (- b) + (- C)
c=5
a=±2
When a = 2,
A+（-B）+（-C）
=2+7-5
=4
When a = - 2
A+（-B）+（-C）
=-2+7-
=0
How to use the scientific calculator in Excel to calculate logarithmic function?
Use the function: log () or log10 ()
How to simplify symbols
Example: + [+ (+ 3)] = + [+ 3] = + 3 = 3
This kind of question from the inside to the outside, first small bracket, then middle bracket, finally big bracket
++For+
--For+
+-I didn't understand the title,
Given that the function f (x) = LG (1 + x) is divided into 1-x, the domain of definition of the function is obtained
(1+x)/(1-x)>0
(1+x)(1-x)>0
(x+1)(x-1)
Given that the function f (x) = ax + B / 1 + X & # 178; is an odd function defined on (- 1,1), and f (1 / 2) = 2 / 5, find the analytic expression of the function and the value of F (x + 2)
For odd functions, then f (0) = 0
b/1=0
b=0
f(1/2)=(a/2)/(1+1/4)=2/5
a=1
So f (x) = x / (1 + X & # 178;)
f(x+2)=(x+2)/[1+(x+2)²]
=(x+2)/(x²+4x+5)
It is known that the function f (x) = 2x + 1 / 2x is used to find the minimum value of the function in the interval (0, positive infinity)
How to find the minimum value of check function?
f(x)=2x+1/(2x)
When 0
A mathematical problem of rational number
Urban time difference
New York - 13
Sydney + 2
London - 8
Clock 1 clock 2 clock 3 clock 4
8:00 4:00 3:00 6:00
Write out which city each clock is, the same time, three other cities and Beijing time
London, Beijing, New York, Sydney
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