The distance between the number axis and the point representing the number 2 is the root, and the number of 6 units long is

The distance between the number axis and the point representing the number 2 is the root, and the number of 6 units long is

2±√6
2 + radical 6 or - (radical 6-2)
As shown in the figure, the corresponding points of 2 and 5 on the number axis are C and B respectively. Point C is the midpoint of AB, then the number represented by point a is ()
A. -5B. 2-5C. 4-5D. 5-2
The corresponding points of ∵ denote 2 and 5 are C, B, CB = 5-2, and ∵ point C is the midpoint of ab. if the coordinate of point a is x, then x = 4-5, and the number represented by ∵ point a is 4-5
On the number axis, the points representing 2 and radical 5 are C and B respectively. C is the midpoint of AB, and point a represents the number
-Root 5 2 - root 5 4 - root 5 root 5-2
A is to the left of C, C is the midpoint of AB, so a + B = 2c, so a = 4-radical 5
The answer is C
4-radical 5
4-radical 5
0.8A conversion of physical electric current=____ mA=____ uA 700uA=____ mA=_____ A 100mA=____ A
Unit conversion of electric current in Physics
0.8A=____ mA=____ UA
700uA=____ mA=_____ A
100mA=____ A
0.8A=__ 800__ mA=_ 800000___ UA
700uA=__ 0.7__ mA=___ 0.0007__ A
100mA=__ 0.1__ A
0.8A=800mA=800000uA
700uA=0.7A=0.00007A
100mA=0.1A
0.8A＝800mA=8*10^5uA
700uA=0.7mA=7*10^-4A
100mA=0.1A
The rules of addition, subtraction, multiplication and division of integers and negatives! It's just like what integers multiply negatives equals (what)!
Well, if you want to be simple, that's it - 3x5 = - 13. - 3 + 5 = 2 - 3-5 = - 8 - 8, divide 2 and get - 4. Addition and subtraction are similar, which is very simple. Multiplication and division are negative and positive, and one positive and one negative answer is negative
Given Tana = 2, find the value of 2 / 3 sin ^ 2A sinacosa + cos ^ 2A
(2/3sin^2a-sinacosa+cos^2a)/cos^2a*cos^2a=(2/3tan^2a-tana+1)*cos^2a=5cos^2a/3tana=2sina/cosa=2sin^2a/cos^2a=4(1-cos^2a)/cos^2a=4cos^2a=1/5(2/3sin^2a-sinacosa+cos^2a)/cos^2a*cos^2a=(2/3tan^2a-tana+1)*c...
2/3sin^2a-sinacosa+cos^2a
=1/3
2/3sin^2a-sinacosa+cos^2a
=(2/3sin^2a-sinacosa+cos^2a)/(sin^2a+cos^2a) (sin^2a+cos^2a=1)
=(2 / 3 Tan ^ 2A Tana + 1) / (Tan ^ 2A + 1) (COS ^ 2A at the same time)
=(2/3*2^2-2/3+1)/(2^2+1)
=3/5
Television can turn electricity into light and power,
It's a bit far fetched to describe sound as "power". Although speakers are driven by power, they are ultimately converted into sound energy
The complete statement is that television converts electric energy into light, sound and heat energy. It must be noted that heat energy accounts for the largest proportion of the final product
What does UA mean in current?
1A=1000mA 1mA=1000uA
Addition, subtraction, multiplication and division of negative numbers
Listen to netizens say negative numbers are difficult, so I want to know how to add, subtract, multiply and divide negative numbers first?
Addition of rational numbers
1. Add two numbers with the same sign, take the same sign, and then add the absolute value of two addends
Example: (- 1) + (- 1) = - (1 + 1) = - 2
2. Add two numbers with different sign, take the sign with larger absolute value, and then subtract the smaller absolute value from the larger absolute value
Example: (- 3) + 2 = - (3-2) = - 1
Subtraction of rational numbers:
1. Subtracting a number is equal to adding the opposite number of the number
Example: 3 - (- 2) = 3 + 2 = 5
It's very simple
Just like a positive number, put forward the minus sign first... Even minus sign is positive, odd minus sign is negative, except 0 of course...
Given Tana = 3, find the value of 2cos (Pie / 2-A) - 3sin (Pie / 2 + a) / 4cos (- a) + sin (- pie-a)
cos（π/2－α）＝sinα
sin（3π/2＋α）＝－cosα
cos（－α）＝cosα
sin（-2π－α）＝－sinα
So the original formula is 2Sin α + 3cos α / 4cos α - sin α
2 Tan α + 3 / 4-tan α is obtained by dividing the molecular denominator by cos α
Because Tana = 3, substitution, the original formula = 9