Mathematics, Problem Solving, Mathematics Problem Solving

One: 90*40%+92*20%+85*40% You can get the result!

2. Average: (5000*1+4000*2+2000*5+1000*12+800*30+500*6) (1+2+5+12+30+6).

Median: A total of 56 people, the middle number is , so find out the salary of people 27 and 28, and find their averages!

Mode: 800 (the number with the highest number of people).

Perhaps: 2Average: (5000*1+4000*2+2000*5+1000*12+800*30+500*6) (1+2+5+12+30+6)=

Let's refer to it.

Median: 800 (the number in the middle after being arranged from small to large or from small to large).

Mode: 300 (most occurrences).

2.Average: (5000*1+4000*2+2000*5+1000*12+800*30+500*6) (1+2+5+12+30+6)=

Median: 800 (the number in the middle after being arranged from small to large or from small to large).

Mode: 300 (most occurrences).

Summary. 2.It can be divided into several plates of division 30 divided by 5=6 to solve the problem mathematically.

Can you ask a question in detail, so that the little master will answer it for you conveniently.

Answer these questions.

The second volume of the second grade.

Hold on. (44-12) divided by 4 = 8 85-9 8 = 132It can be divided into several plates of division 30 divided by 5=6

Ask about custom messages].

What is the distance between A and B? Isn't the topic incomplete?

Let the distance of A and B be x kilometers.

When two cars meet, the time it takes is:

160 + x) 50 + 60) =160 + x) 110 hours, so after (160+ x) 110 hours, the two cars meet and the distance traveled by the truck is:

50 * 160 + x) 110 = 800 + 5x) 11 km.

So the distance from place B at the time of meeting is: x - 800 + 5x) 11 = 6x - 800) 11 km.

Take the distance of A and B as an example of 200 km.

When two cars meet, the time it takes is:

160 + 200) 50 + 60) = 36 11 hours, so after 36 11 hours, the two cars meet and the distance traveled by the truck is:

50 * 36 11) = kilometers.

So the distance from place B when we meet: 200 - = km, I hope it will help you.

I don't understand hi

This question is interesting, what is the distance between A and B?160?

The questions are incomplete, there are too many answers, and I am too lazy to write.

Solution: Conic volume = volume of cylindrical water surface elevation = 314 cubic centimeters.

The height of the cone: cm.

A: The height of this conical iron cone is centimeters.

Height=314 cm.

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314 cm).

The volume of the rising part of the water surface (cone):

314 cubic centimeters).

Cone Volume Formula:

v＝1/3sh

h = v 3 s cm).

Solution: Let the height of the conical iron cone be h cm, then.

1/3 x =

Solution, h = A: The height of a conical iron cone is centimeters.

The volume of the cone is 314 cubic centimeters.

So the height is centimeters.

This is the volume of conical iron.

The volume of the above equation x3 is then divided by the height.

The answer is centimeters.

Solution: From the question: the volume of water rising is the volume of the cone.

Volume of water = base area x height = cubic centimeters.

The height of the cone: cm.

So lazy, just set the formula.

There are a total of 13 students in this class, then the male student can see 13-1 = 12 classmates, and at this time, there are as many students wearing blue hats and red hats, so they are all 12 2 = 6 people, which means that the male student Lu pretended to be 6 male classmates and 6 female students returning to school. Therefore, with the addition of the male classmate, there are a total of 7 male students and 6 female students in this class.

It turned out that there were x bacteria in the dish.

2^3 x-8)*2-8]*2-8=832x=64

x=2A: It turns out that there are 2 bacteria in the dish.

Let the original x, then.

2x at the end of day 1.

4x at the end of day 2.

8x-8 pcs at the end of day 3.

16x-16-8 at the end of day 4.

At the end of day 5, 32x-32-16-8 = 8

Calculate x = 2.

Solution: Assuming that there are x bacteria in the original dish, then:

x*2*2-8)*2-8]*2-8=8

x=4A: It turns out that there are 4 bacteria in the dish.

2, the key arguments are too many to count, and the topic bacteria theory is not suitable for 2*2*2*2*x-(5-2)*8=8

1: Let the length be 3x the width be 2x, so the circumference 4=10x x= length: width:

The area is 2: let the difference be x and the subtraction will be 5x the subtraction will be 6x 6x+5x+x=60 x=5 so the minus = 25

1.4 2=2 (cm) 3+2=5 (portions) 2 5=cm) cm) cm) cm) square centimeter) Answer: The area of this rectangle is square centimeters.

2.1+5=6 (parts) 6+6=12 (parts) 60 12=5 5*5=25 Answer: The minus is 25.

Set the bottom surface length x, width y, height z

The surface area of the cube is 2xy+2yz+2xz

The area of the cuboid rolling surface is 2xy+2y(z+2)+2x(z+2), and the above two formulas are subtracted to obtain a large and high blind fruit 48

i.e. x+y=12

Because it is a cube, x=y=z=6

Volume = xyz = 216

The volume of water v=20*16*7=2240 cm*cm*cm

After standing up, v=10*16*x=2240

x=2240/10/16=14 cm

Originally, the water volume was 20*16*7

There are also two cases when it is erected, and the bottom area is 20*10 or 16*10

The two answers are 20*16*7 20*10=or 20*16*7 16*10=14

The volume of water is 20 times 16 times 7 = 2240

Stand up: The container is 16 long, 7 wide, and 20 high

The water height is 2240 divided by [16 times 7], which is equal to 20