What is the relationship between the parts in the formula of addition, subtraction, multiplication and division What is the relationship between the parts of an addition formula The relationship between the parts of the subtraction formula The relationship between the parts of multiplication formula The relationship between the parts in the division formula Help. Thank you

What is the relationship between the parts in the formula of addition, subtraction, multiplication and division What is the relationship between the parts of an addition formula The relationship between the parts of the subtraction formula The relationship between the parts of multiplication formula The relationship between the parts in the division formula Help. Thank you

That is, in addition, the relationship between two addends and sum, such as one addend equals and subtracts the other addend, etc
In subtraction, the relationship between the subtracted, the subtracted and the difference
In multiplication, the relationship between factor and product
In division, the relationship between divisor, divisor and quotient

The smooth circular track with radius R is fixed in the vertical plane, and a small ball with mass m moves in a circle in the track. When passing through the highest point C, the pressure on the track is large
Mg, it is known that the period of circular motion of the ball is t, then what is the average power of gravity acting on the ball from C to the lowest point a? When the ball passes through the highest C, what is the instantaneous power of gravity acting on it

(1) In the process from C to the lowest point a, the result of gravity work is that the potential energy of gravity decreases and the kinetic energy increases, while the running time is t / 2
Average power = 2rmg / (T / 2) = 4mgr / T
(2) When the ball passes through the highest point C, the direction of motion is horizontal and perpendicular to the direction of gravity. Therefore, at this moment, gravity does no work on the ball, and the instantaneous power is 0

In known arithmetic sequence {an}, A3 * A7 = - 16, A4 + A6 = 0, find the first n terms of {an} and Sn

∵ {an} is an arithmetic sequence
∴A4+A6=A3+A7=0
A3 * A7 = - 16
The solution is A3 = 4 A7 = - 4 or A3 = - 4 A7 = 4
① When A3 = 4, a7 = - 4
Then 4D = - 8 gives d = - 2
∴An=A3+(n-3)d=4-2n+6
That is, an = 10-2n
Sn=(9-n)n=9n-n²
② When A3 = - 4, a7 = 4
Then 4D = 8 and d = 2
∴An=A3+(n-3)d=2n-10
Sn=n(n-9)=n²-9n

The vehicle starts from a standstill with an acceleration of 4m / s, and the speed at the end of 10s and the displacement within 10s are calculated

v=at=4*10=40
s=1/2at2=200

Xiao Gang was born in October. His age is twice that of this year plus 7, which is exactly the total number of days in the month when he was born. How old is Xiao Gang this year

Suppose he is x years old
You can see that October has 31 days
therefore
2x+7=31
2x=24
x=12
So I'm 12 years old

She didn't know where she could go at that time
She didn’t know ____ ____ _____ at that time.
The woman left the hospital with a baby in her arms
The woman left the hospital_____ _____ _____ _____ ____ ____ .
I don't know where he is
I don't know____ ____ ____ .

1.where to go
2.with a infant in her arms
3.where he is

On the number axis with unit length of one centimeter, draw a line segment a B with length of 1000 centimeter at will. How many integer points are covered by line segment a B?

1000

Xiao Ming has four different hats, two different coats and three different pairs of trousers. If you take one pair of trousers out of it, how many kinds of hats and coats can be matched into a suit
Different approaches

4*2*3=24

If 3x ^ 2m-5y ^ 2 and - x ^ 3Y ^ 2 are of the same kind, find the value of M
2 times of 3x, 2 times of m-5y and 3 times of - x, 2 times of Y

If it is a similar term, 2m-5 = 3
m=4

How many cubic meters is 1000 cubic centimeters

1000 cubic centimeter = 1 cubic decimeter = 0.001 cubic meter