Under what circumstances f-f = ma. How to calculate the external force of f-f = ma

Under what circumstances f-f = ma. How to calculate the external force of f-f = ma

In fact, it depends on what your f stands for. If f stands for resultant force, then f = ma & nbsp;
How to find the resultant force? To synthesize the force, you can draw a parallelogram, as shown in the figure

Meaning of thermometer symbol
There are two symbols for household thermometers. One is f on the left, which means centigrade; the other is C on the right, which means what? Does it mean relative humidity? If it means relative humidity, the higher the relative humidity, what does it mean in real life?

F is Fahrenheit and C is centigrade
Fahrenheit = 32 + centigrade × 1.8
Centigrade = (fahrenheit-32) △ 1.8

The symbol "centigrade" on the thermometer indicates () temperature?

C plus one zero
0
C
.
C

What do you mean by crossing the set of points a and B on the line of fire

What's the meaning of a, I, B in the mathematics set of senior one?

A | B, a or B, is the union of a and B

What is the meaning of a in B I set

If in University, a|b is the probability of a under the premise that B occurs;
If it's high school, it's a ∩ B

An operation that defines sets a and B:
A * b = {x | x = X1 + X2, where x1 ∈ a, X2 ∈ B}, if a = {1,2,3}, B = {1,2}, then the numbers of all elements in a * B are

A * b = {x | x = X1 + X2, where x1 ∈ a, X2 ∈ B}
A={1,2,3},B={1,2}
x1+x2=x
1+1=2
1+2=3
2+1=3
2+2=4
3+1=4
3+2=5
A*B={2,3,4,5}

For set a, B defines a * b = {(a, b) a ∈ a, B ∈ B}. If a = {1,2}, then a * a =, fast

A*A={(1,1),(1,2),(2,1),(2,2)}

A and B are two sets. How to calculate them?

It's the difference set
A / b = {X: X belongs to a but X does not belong to B}

What is the operation of a set, a / b

Your question is a little big. Give some typical examples. If so, a / b = CRB u a