Math masters help me I m in a hurry, I have to hand in my homework tomorrow

This question. Ask Hua Luogeng to go!.

Can it be less? This is inevitable ... The score is not too high...

Don't read it, go home and herd the cows! Lazy to this point! Don't let the cow go!

The process is too troublesome, so I'll give you the answer, and remember to do it yourself next time.

It's too easy, so let's figure it out ourselves.

(1) There are 50 people in total, so according to the number of people, =50-3-6-11-13-6=11

Then set the position donation to $x according to the average.

50x38-10x3-15x6-30x11-50x13-60x6=11x

Calculate x=40

Answer: 40 yuan, 11 people.

2) Put the donation number.

The median of 10, 15, 30, 40, 50, and 60 is the middle number, and if there are two in the middle, it is the average of the two Answers:

(1) 50-3-6-11-13-6=11 (person).

50x38-10x3-15x6-30x11-50x13-60x6) 11=40 (yuan).

2) The mode is 50 and the median is 35

(1) Have you ever studied equations? It's very simple.

A person who has a polluted place.

The number is x, so 3+6+11+x+13+6=50, so the number of people in the polluted place is x=11

The amount of money to set up the contaminated area is y

So 3*10+6*15+11*30+11*y+13*50+6*60=38*50

So y=40

Result: Donation (RMB) 10 15 30 40 50 60

Number 3 6 11 11 13 6

2) The median donation amount of the class is (30+40) 2=35

Dizzy, do it yourself, it's easy to come up with, think about it.

If you buy x copies of this kind of evening newspaper from the newspaper every day, the monthly profit is Y yuan. then y (120 x 200).

It is easy to know that when x = 200, y is maximum, and at this time, when x 200 y 440 there are also two ranges that are not considered.

0200 ,y=（

At x=200, y is maximum. y=440。

Therefore, the maximum monthly profit is 440 yuan.

Sister-in-law Li bought 150 copies of this kind of evening newspaper in June this year, are you sure that it is 150 copies?

Forehead bit bit tick

3 7 = loop, 2006 6 remainder 2, so the 2006th bit is the second number in the loop, which is 2

Method: Find the cycle of the cycle.

The remainder of 2006 6 is 2

So, the number in the 2006th decimal place is 2

Be...

Every 6-bit loop.

2006 is divided by 6, and the remainder is 2

The second place is 2

Answer: 2

3 7 = these 6 digits loop], 2006 6 = 334 remainder 2, so the number in the 2006th digit after the decimal point is 2

The number in the 2006th digit after the circular decimal point is 2

The result is ... 6 digits in a cycle, 2006 divided by 6 to get 334 and 2, so the 2006th bit is 2!

This is obviously a circular decimal. Do the math yourself.

Hello the result is a wireless loop decimal and the loop section is 428571 So the 2006th bit should be 2006 divided by 6, and the result is 334 remainder 2, which is the second number 2 of the cycle section

3 7 = cycle, with six digits as the cycle, calculate what the 2006th is by yourself.

The radius of the bottom surface of the enclosed cylinder

The volume of this grain hoard can store 600 kg of rice.

Circumference: m).

Radius: m) Volume: m³).

Storable paddy: kg).

From the inscription, it can be obtained: when the width of the rectangular reed mat is taken as the height of the straight column, the largest straight cylindrical beam can be obtained.

At this time, the circumference of the bottom surface of the straight cylindrical beam tun = m = 2 *, then the bottom radius r = 1 m then the volume of the straight cylindrical beam tun = bottom area * height = cubic meter.

Then the amount of rice that can be stored in the straight cylindrical beam = kg.

The circumference of the bottom surface of the cylinder = d Because of the joint, the circumference of the bottom surface of the enclosed grain hoard is taken, so the diameter d= so the radius r=2 2=1m The area of the bottom of the cylinder = r So the area of the bottom of the cylinder is. Because the reed mat is 2 meters wide, the height of the enclosed grain hoard is 2 meters. Cylindrical volume = sh =

So 600*

Solution: It can be surrounded by 2 cylinders, but the cylinder with a height of 2 meters is larger.

Cylinder bottom circumference = d

Because of the joints.

Therefore, the circumference of the bottom of the enclosed grain hoard is rice.

Take, so diameter r=

The volume of the cylinder is = r * r * h = cubic meters.

Therefore, the grain hoard can store kilograms of rice.

That's it!

Solution ideas:

Cylinder bottom circumference = d

Because of the joints.

Therefore, the circumference of the bottom of the enclosed grain hoard is.

Take, so diameter d=

So radius r=2 2=1m cylindrical base area = r so cylindrical base area is.

Because the reed mat is 2 meters wide, the height of the enclosed grain hoard is 2 meters.

Cylindrical volume = sh =

So 6000*

Process: 1 1 cubic meter).

Answer: This grain hoard can store 3768kg of rice

Taking one kilogram as an example, the original profit margin is 2 a, and the current profit margin is (a+2+2b-a-b) (a+b)=(2+b) (a+b)>2 a

So the profit margins have increased.

The profit margin before the price increase 2 a is subtracted from the profit margin after the price increase 2+2b a + b.

2b(1-a)/a(a+b)

Because a>2, 2b(1-a) a(a+b)<0, i.e., the profit margin is reduced.