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Set AB cars to be X and Y cars respectively.

Condition to be met: x+y<=50

35x+25y>=1530, that is, 7x+5y>=30615x+35y>=1150, that is, 3x+7y>=230 Find the minimum value of the total cost z=.

This is a linear programming problem, and there are three ways to solve it:

The most cost-effective thing for X Y Z is the third type: renting a car for 30 and 20 cars B. The cost is 310,000.

Column two unequal equations, that is, the amount of goods is exceeded separately, and there are three kinds of solutions, namely.

a 28b 22

a 29b21

a 30b 20

Multiply that by the shipping cost to see which option is the most cost-effective.

Set: A car x is required, and B car is (50-x) car.

35x+25(50-x)>=(the meaning of this symbol is greater than or equal to)1530 (1)15x+35(50-x)>=1150 (2)Simplify(1)get: x>=28

Simplifying (2) yields: x<= 30

So: 28<=x<=30

And because: x is a positive integer.

So: x

then 50-x

A: There are three schemes: 28 cars for car A and 22 cars for car B; 29 cars and 21 cars; 30 cars A and 20 cars B.

There are two ways to calculate which is the most saving:

1: (1) 280,000 yuan).

290,000 yuan).

300,000 yuan).

Two: (If you have studied the function once in junior high school).

It costs $w to set up this transportation.

w=w decreases as x increases. So when x takes the maximum value of 30, w minimum = 31 Answer: The third option A car 3020 cars B are the most cost-effective, costing 310,000 yuan.

The purchase price of apples is yuan kilograms, that is, 600 yuan per ton.

Now we take a ton of apples as the object of investigation. Calculate the cost of the acquisition first.

The cost per ton of apples is 600+1 300 yuan.

In order to achieve a 20% profit, you must earn 945 (1+20%) = 1134 yuan after buying the acquired apples.

But with so much money, you can no longer buy a ton of apples, because 10% of them are lost in the shipping and wholesale process.

So there are only tons of apples that can be bought at this time.

Divide the total value of apples by the total quantity and the list price: 1,134 yuan tons, which is converted into kilograms and yuan kilograms.

300 RMB.

30 1000 = yuan.

Yuan. 1 (1-10%) = kilograms.

Yuan. A: Each kilogram of apples should be priced at RMB.

The total cost per ton is 330*, and the price is x tons if the apple is 1 ton.

x=1185

So dollars per kilogram.

Hope it works for you. Feel free to ask.

The distance from the intersection of the inner angle bisector o to each side is equal, and the inner angle bisector divides the triangle into 3 triangles, all of which are equal in height, then the sum of the areas is (ab*high+ac*high+bc*high) 2=6

Simplify: (ab+bc+ac)*high 2=6

AB+BC+AC=12, the high is 1

Therefore. The distance from the intersection of the bisector of its inner angles o to ab is 1 cm

Deform the equation with x as an unknown number.

x=(a2+2a+3)/(a-1)

x=[(a2-2a+1)+(4a-4)+6] (a-1)x=(a-1)+4+[6 (a-1)]=a+3+[6 (a-1)]Just make [6 (a-1)]=an integer.

i.e. a-1 = 6

The integer value of x is 11, -3

a-1= 3.

The integer value of x is 9, -1

a-1= ±2

The integer value of x is

a-1= ±1

The integer value of x is 11, -3

So the total integers are only , -1, -3

ax-3=a^2+2a+x

a-1)x=a^2+2a+3

a<>1

x=(a^2+2a+3)/(a-1)

x=(a^2+2a-3+6)/(a-1)=a+3+6/(a-1)=a-1+6/(a-1)+4

1.a>1 x>=2*root 6+4 > = x is an integer 2. greater than or equal to 9a<1 x<-2 * root number 4+4 < = x is an integer less than or equal to -1.

The topic is the use of the multiplicative distributive law:

Since there is a term (1 2 + 1 3 + 1 4) in each term, it can be considered as a common factor:

So the original formula = [1+(1 2+1 3+1 4)]*1 5+(1 2+1 3+1 4)] 6 5+(1 2+1 3+1 4)]*1 2+1 3+1 4)).

Let the number A be x, then its reciprocal is 1 x, and the reciprocal of the B number is, according to the title, get:

1/x-(2/x=

x=2 then the reciprocal of number B is.

So the number B is 10 51

Armor. The two numbers B are 51.

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