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>Where do the perimeter of these figures refer to_ Teaching plan of unit 3 quadrilateral
·The teaching objective: 1. Let the students perceive the meaning of a figure's circumference in combination with specific situations. 2. In the process of solving problems, explore the length of various figure's circumference, and cultivate the students' preliminary application consciousness and ability to solve practical problems
Mother monkey took out 13 peaches and gave them to three children. The eldest one was half, the second one was one-third, the third one was one-quarter. The eldest one said, "I can divide six and a half." mother said, "I can't cut the peaches." how can I divide them? It's not a sharp brain turn!
Take out one first. Half of the remaining 12, that is, six, one-third, that is, four, and the other two, plus the one you took out at the beginning, will be given to the third
Clever calculation
(1 + 1 / 2 + 1 / 3 + 1 / 4) multiply (1 / 2 + 1 / 3 + 1 / 4 + 1 / 5) minus (1 + 1 / 2 + 1 / 3 + 1 / 4 + 1 / 5) multiply (1 / 2 + 1 / 3 + 1 / 4)
Let 1 / 2 + 1 / 3 + 1 / 4 = a
1/2+1/3+14+1/5=B
Original formula = (1 + a) B - (1 + b) a
=B+AB-A-AB
=B-A
=(1/2+1/3+14+1/5)-(1/2+1/3+1/4)
=1/5
1. The sum of a two digit ten digit number and a single digit number is 8. After the ten digit number is exchanged, the new number is 18 smaller than the original number, then what is the original two digit number? 2. If you buy two ballpoint pens and a notebook, it costs 4 yuan; if you buy one value ballpoint pen and two notebooks, it costs 5 yuan, then how much does it cost to buy four ballpoint pens and four notebooks? 3, In the spring of this year, it cost 44000 yuan to plant two kinds of greenhouse vegetables, eggplant and tomato, of which 2400 yuan is net profit per mu for Eggplant and 2600 yuan is net profit per mu for tomato. How much is the total net profit?
A system of linear equations with two variables!
5. It is known that the annual income ratio of Party A and Party B is 3: the annual expenditure ratio is 7: the year-end bonus is 400 yuan for each of them. If the annual income of Party A is X Yuan and the annual expenditure is y yuan, what are the equations?
1. The sum of a two digit ten digit number and a single digit number is 8. After the ten digit number is exchanged, the new number is 18 smaller than the original number, so what is the original two digit number? Suppose the ten digit number is x, and the single digit number is YX + y = 810x + y = 10Y + X + 18, then the solution is x = 5Y = 3. Answer this number is 532
For a two digit number, the number in the ten digit number is 2 less than that in the one digit number. If the number in the two digit number is exchanged, the sum of the new two digit number and the original two digit number is 176. Find the two digit number
Let the single digit of this two digit number be x and the ten digit number be y. according to the meaning of the question, the equations are listed as follows: y = x − 210y + X + 10x + y = 176, and the solution is x = 9y = 7.10y + x = 70 + 9 = 79
There is a two digit number, and the sum of the two digits is 10. Exchange the positions of the two digits, and the two digits are 36 larger than the original two digits. Find the original two digits
Let X be the number on ten bits and 10-x be the number on one bit
10X+10-X+36=10*（10-X）+X
X=3
So 10-x = 7
The double digit is 37
There is a two digit number. Its single digit number is twice that of the ten digit number. After exchanging the position between the single digit number and the ten digit number, the number obtained is 18 times larger than the original number
Find the original two digits
Let the number of digits be X
10*（1/2）x+x=10x+（1/2）x-18
6x=10.5x-18
4.5x=18
x=4
4*(1/2)=2
So the original number is 24
If a, B and C represent a three digit number of one digit, ten digit and hundred digit respectively, a new three digit number will be obtained by exchanging the positions of a and C, and the two numbers will be combined
Can you find any regularity in the results?
ABC represents a three digit number of one digit, ten digit and hundred digit respectively
Then the number is: 100C + 10B + a
Exchange the positions of a and C 100A + 10B + C
100c+10b+a-(100a+10b+c)=100c+10b+a-100a-10b-c
=99c-99a=99(c-a)
So the difference is a multiple of 99
Use the formula to show that the number on the ten digit is a and the number on the single digit is the two digit of B. then exchange the single digit of the two digit with the number on the ten digit
10A+B
10B+A
A two digit number, exchange its ten digit number and one digit number and subtract them. The difference is 18. How many two digit expressions like this can you write?
31,13
02,20
42,24
13,31
53,35
24,42
64,46
35,53
75,57
46,64
86,68
57,75
97,79
68,86
79,97
Write in VB
Option Explicit
Private Sub Form_ Load()
Dim i As Long
Dim jiaohuan As String
Dim jieguo As Long
Dim shuju As String
For i = 10 To 99
jiaohuan = Mid(i, 2, 1) & Mid(i, 1, 1)
If Abs(jiaohuan - i) = 18 Then
jieguo = jieguo + 1
shuju = shuju & Mid(i, 2, 1) & Mid(i, 1, 1) & "," & i & vbCrLf
End If
Next
MsgBox jieguo
Text1.Text = shuju
End Sub
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