Mathematical modeling of fish farming problems, please help me take a look

Classmate, you are also a general worker of the Western Post?

Give me points, I'll model it for you, list each condition with a formula, and finally consider it comprehensively.

There are so many uncertainties in aquaculture that there is no point in calculating them.

It's a matter of sheep eating grass.

Is the fish still a kilogram per square meter when it grows up? Do big fish eat small fry? Do fish grow so slowly?

Depending on the topic, set up variables.

Set the number of transports by region (tonnes).

Set function Chinese mainland Philippines United States France.

Hong Kong A1 B1 C1 D1

Taiwan A2 B2 C2 D2

a According to the title, the following equations and inequalities can be listed:

a1+a2=90

b1+b2=45

c1+c2=80

d1+d2=60

a1+b1=c1+d1

a2+b2=c2+d2

a2+b2≤65

, the objective function is .

f = shipping costs for all locations.

f=55a1+67a2+72b1+58b2+160c1+150c2+190d1+210d2

Using MATLAB to solve, obtain.

a1 =a2=b1=

b2=c1=

c2=d1=

d2=b.For the increase of market demand, the variables k1 and k2 are introduced, and the equation and inequality for the first question are still true for the second question.

K1: U.S. shortage.

K2: Shortage in France.

From the title you can get:

a1+a2=90

b1+b2=45

c1+c2=80

d1+d2=60

a1+b1=c1+d1

a2+b2=c2+d2

a2+b2≤65

k1+c1+c2=100

k2+d1+d2=80

k1、k2≥0

k1≤100

k2 65 However, for the objective function, k1 and k2 are introduced.

f = the amount of money earned - transportation costs - processing and cost expenses.

f=4000*(c1+c2)+6000*(d1+d2)+2000*(k1/100+k2/60)-(55a1+67a2+72b1+58b2+160c1+150c2+190d1+210d2)-337500

Using MATLAB to solve, obtain.

k1=k2=

a1=a2=

b1=b2=

c1=c2=

d1=d2=

It's a matter of mathematical modeling, and there will be models on the Internet

The following two factors are taken into account: (1) "The transfer of students from one school to another is calculated by mathematical statistics." In addition, the number of cheeses for both types of cheese is slightly higher than the b-value, 5% to 10% more

If you're not in a hurry. And so on These kinds of questions are very difficult.

All happiness v map.

This data is ** on the map, and the final result is subject to the latest data on the map.

Set A, B, and C to produce x, y, z, and profit w per month

The relation w = 320x + 350y + 410z 70000

Wield. Mathworks, Lingo, two software, one is the main model and the other is the verification beam model, note the branch and meaning xyz as an integer, this problem is not difficult to mainly lattice traces.

Pure hand-played.

I guess there are other complex data.

For example, giving bonuses to employees will make employees work harder, so that the efficiency of the enterprise can be improved, how much income can be obtained, and the same expansion of the enterprise's welfare facilities What is his income function What is the income function of introducing technology and new equipment... And then we build a model to figure out how these three functions are proportioned when they sum up to the maximum.

According to the actual situation! Is this a math problem, and if so, it is more appropriate to divide it in ** ratio.