3rd grade math. How to write a process

8.Playground circumference = 2 * (100 + 50) = 300 meters.

Running two laps a day for two consecutive days = 300*2*2=1200 meters.

9.s1 = 50 * 16 = 800 (square meters).

s2 = square meters).

Required bricks = 800 bricks.

The price of the small square = 20,000 * 2 = 40,000 yuan.

10.Width = (32-12) 2 = 10 meters.

Fence area = 10 * 12 = 120 (square meters).

8. For several days in a row, I didn't see it clearly.

100+50)*2=300 (meters).

300 * 2 * number of days = result (m) (please bring the number of days in and calculate the result) Answer: Xiao Ming ran a total of m.

16 = 8000 (square meters).

2 dm = m.

square meters) 8000 blocks).

200,000*2=400,000 (yuan).

Answer: It costs 400,000 yuan to shop this small square.

10. (32-12) 2=10 (m).

10*12=120 (square meters).

Xiao Ming's question is to calculate the perimeter of the playground first, 2 laps by the circumference, I don't know why I want to say what it means to run two laps around the stadium for two consecutive days, and how not to run two laps at one time.

Huahua: 1 pencil case + 2 automatic pens = 14 yuan.

Multiply the two sides by 41 pencil cases + 2 automatic pens) 4 = 14 4

That is, 4 pencil cases + 8 automatic pens = 56 yuan.

Lingling: 4 pencil cases + 3 automatic pens = 36 yuan.

4 pencil cases - 4 pencils and +8 mechanical pens - 3 mechanical pens = 56-365 mechanical pens = 20

1 automatic pen = 4 yuan.

So 1 pencil case = 14-2 4 = 14-8 = 6 yuan.

1.Column equations are solved.

Solution: Set a pencil case x yuan and an automatic pen y yuan.

x+2y=14

4x+3y=36

Therefore x=6 y=4

A: A pencil case is 6 yuan, and an automatic pen is 4 yuan.

2.If you haven't learned the equations.

14x4-36=20 (yuan) ......14x4 is 4 pencil cases of 8 and automatic pen **.

……14x4-36 is the price of 5 mechanical pencils 20 5 = 4 (yuan) ......A pencil 4 yuan 14-4x2 = 6 (yuan) ......A pencil case for 6 yuan means that a pencil case with 2 automatic pens 14, the 4 pencil cases and 8 automatic pens are 56, and with 56-36 is to use 4 pencil cases and 8 automatic pens - 4 pencil cases and 3 automatic pens to get the price of 5 automatic pens.

So divide 20 by 5 to get the price of an automatic pen, and then find the price of the pencil case over

The topic is relatively simple, 2) East; West; South; North;

3) North; West;

4) The quotient is a cyclic decimal;

5) Dividend.

Find the shadow edge length.

Long = 40-15 = 25

Width = 50 - 15 - 15 = 20

s shadow -25 20 = 500

c shadow = 25 + 25 + 20 + 20 = 90

Rectangle circumference (length + width) 2

The width of the shaded part is 50-15-15 20

The length of the shaded part is 40-15-25

So the circumference (20+25) is 2 90

The area of the rectangle is long and wide.

So the area is 25 20 500

Friends, you have to remember to bring the unit, because I don't know if your unit is centimeter or meter.

Just read the book, do the questions in the book, you can understand the questions in the book, it's OK, the principle is the same, just change a little, if there is still time, and then expand the more difficult questions, the college entrance examination is to test those things, check what is the key content of the previous exams, grasp the key points, and the key points that the teacher said are also more important, calm down, it is just an exam, what determines the exam of life.

I use 1234 to represent 4 people, and swapping the order between each other is a method, such as 1234 1243 1324 1342 1423 1432 This is the order of 1 in the first place, there are 6 kinds of them, and in the same way, there are 4 kinds of 4 numbers in 4 permutations, which is 4*6=24