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If Mn = 2cm, the length of AB is () A. 60cmB. 70cmC. 75cmD. 80cm
As shown in the figure, assuming AB = a, then am = 25A, an = 37a, ∵ Mn = 37a-25a = 2, ∵ a = 70
There are two points Mn on the line AB, point m divides AB into two parts of 2:3, point n divides AB into two parts of 2:1, and Mn = 2cm
_____________________
A M N B
Point n divides AB into 2:1 parts -- > an = AB * 2 / 3
Point m divides AB into 2:3 parts -- > am = AB * 2 / 5
So, Mn = an-am = AB (2 / 3-2 / 5)
=AB*4/15
So AB = Mn / (4 / 15)
=MN*15/4
=2*15/4
=7.5cm
As shown in the following figure, there are two points m on the line AB, N point m divides AB into two parts 2:3, and point n divides AB into two parts 2:1, and Mn = 2cm
A_____________ M_____________ N_____________ B
Point m divides AB into two parts: 2:3
∴AM=2/5AB
Point n divides AB into 2:1 parts
∴AN=2/3AB
∴MN=AN-AM=4/15AB
∵MN=2cm
∴AB=7.5㎝
The number of integer solutions of the equation x + y = 3 is
RT
Innumerable (- 100,97) (100, - 97) and so on, you asked is a positive integer, is 4
Help to see the conversion relationship of these conductivity units
Please help to write the unit symbols of all orders of magnitude of conductivity (only in meters)
In addition, what s / M is 1ps / M equal to
p:pico
10^（-12）
Others are too lazy to write
Given f (x) = x & # 178; find f (x-1)
f(x-1)=(x-1)²
=x²-2x+1
Input voltage power consumption input total power
220v 0.7kw•h 120w
If it is calculated according to the total input power of 120W and working time of 24h, the consumed electric energy is______ The calculation result is quite different from the relevant data provided on the refrigerator nameplate, because the refrigerator has_______ It is caused by the characteristics of the work
2.88KW.h
Refrigerators use the function of evaporation cooling or gasification heat absorption to achieve the purpose of refrigeration
Characteristics of intermittent operation
Simple calculation of 39 + 39 / 61
（39+39/61）÷39
=39÷39+39/61÷39
=1+1/61
=1 and 1 / 61
I want to make a 220 V direct supply LED lamp, seek circuit diagram
I can't map it here. What's the output power? I have many solutions
(1) Root sign 0.0625 = 0.250.625 ≈ 0.791 6.25 = 2.562.5 ≈ 7.91625 = 25 6250 ≈ 79.1 62500 = 250 what rules do you find
Can you tell the truth?
(2) Use a calculator to calculate root 3 (accurate to 0.001), and use the rule you found to say the approximate values of root 0.03, root 300, root 30000. Can you tell what root 30 is according to the value of root 3?
(3) Use calculator to calculate, triple root number 0.00216, triple root number 0.216, triple root number 216, triple root number 216000. What rule can you find? Use calculator to calculate, triple root number 100 (accurate to 0.001), and use the rule you found to find the approximate value of triple root number 0.1, triple root number 0.0001, triple root number 100000
(4) From 10 to 1000, 100 to 1000000, can you determine the number of digits of the triple root 59319?
(5) The number of 59319 is 9. Can you determine the number of single digits of the triple root 59319?
(3) If you cross out the three digits 319 after 59319 to get the number 59, and 3 & # 179; = 27,4 & # 179; = 64, can you determine the tens of the triple root 59319?
(1) Root sign 0.0625 = 0.250.625 ≈ 0.791 6.25 = 2.562.5 ≈ 7.91625 = 25 6250 ≈ 79.1 62500 = 250 what rules have you found? Can you tell the truth?
The decimal point of the square root is moved two places to the left or right, and the result of the value is also moved one place to the left or right
Truth, √ 100 = 10 √ 0.01 = 0.1
(2) Use a calculator to calculate root 3 (accurate to 0.001), and use the rule you found to say the approximate values of root 0.03, root 300, root 30000. Can you tell what root 30 is according to the value of root 3?
√3=1.732
√0.03=0.1732
√300=17.32
√3=173.2
Cannot say root 30 based on the value of root 3
(3) Use calculator to calculate, triple root number 0.00216, triple root number 0.216, triple root number 216, triple root number 216000. What rule can you find? Use calculator to calculate, triple root number 100 (accurate to 0.001), and use the rule you found to find the approximate value of triple root number 0.1, triple root number 0.0001, triple root number 100000
The decimal point of the square to be opened is moved three places to the left or right, and the result of the value is also moved one place to the left or right
3 times root 100 = 3.642
3 times root 0.1 = 0.3642
Cubic root 0.0001 = 0.03642
3 times root 100000 = 36.42
(4) From 10 to 1000, 100 to 1000000, can you determine the number of digits of the triple root 59319?
Double digit
(5) The number of 59319 is 9. Can you determine the number of single digits of the triple root 59319?
nine
(3) If you cross out the three digits 319 after 59319 to get the number 59, and 3 & # 179; = 27,4 & # 179; = 64, can you determine the tens of the triple root 59319?
three
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