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21 tháng 12 2015

Mình nhầm! -22 mới đúng! K = -22 nha

17 tháng 3 2016

mấy cái bạn kia đưa ra kết quả sai rồi bạn xem mình giải nhé

người ta cho x tỉ lệ thuận với y theo hệ số k nên ta sẽ có:

x=ky

vậy thì suy ra \(\frac{x}{y}=k\)rồi bây giờ trực tiếp thay vào nhé:

\(\frac{x_1}{y_1}=\frac{x_2}{y_2}=\frac{3x_1}{3y_1}=\frac{6x_2}{6y_2}=\frac{3.6}{3y_1}=\frac{6.4}{6y_2}=\frac{18-24}{3y_1-6y_2}=\frac{-6}{22}=\frac{-3}{11}=k\)

21 tháng 12 2015

x=8y ; z =4x =4.8y = 32y

=> Then  z is directly proportional to y  with the scaling factor is  32

21 tháng 12 2015

 đề bài

Nếu x là tỷ lệ thuận với y theo hệ số tỉ lệ là 8, z tỉ lệ thuận với x với hệ số tỉ lệ là 4.
Sau đó z là tỷ lệ thuận với y theo hệ số tu=ỉ lệ nào.

21 tháng 12 2015

y = -11/3x => x =-3/11 y  => k = -3/11

5 tháng 8 2016

x tỷ lệ nghịch với y nên x.y = k =6.1/2 = 3

hệ số k=3

( Đặng Quỳnh Ngân IQ106)

4 tháng 2 2016

toán tiếng anh à

toan bang tieng anh ha ban

Question 1:Fill the suitable number in the following blank?.\(343=\)_____\(3\)Question 2:The positive value of  such that  \(\left|2x-3\right|+7=16\) is _______Question 3:Given a function \(g\left(x\right)=2\sqrt{x-7}\) . Find the value of \(g\left(11\right)\)?Answer: The value of \(g\left(11\right)\) is ._________Question 4:Find the value of  such that \(0,008=\left(0,2\right)^x\).Answer: . \(x=\)_________Question 5:Given a function\(g\left(x\right)=\frac{2}{3-x}\) . Find the value...
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Question 1:
Fill the suitable number in the following blank?
.\(343=\)_____\(3\)

Question 2:
The positive value of  such that  \(\left|2x-3\right|+7=16\) is _______

Question 3:
Given a function \(g\left(x\right)=2\sqrt{x-7}\) . Find the value of \(g\left(11\right)\)?
Answer: The value of \(g\left(11\right)\) is ._________

Question 4:
Find the value of  such that \(0,008=\left(0,2\right)^x\).
Answer: . \(x=\)_________

Question 5:
Given a function\(g\left(x\right)=\frac{2}{3-x}\) . Find the value of .\(g\left(1\right)+g\left(2\right)\)
Answer: The value of \(g\left(1\right)+g\left(2\right)\) is ._______

Question 6:
Suppose that \(\frac{7y-x}{2x+y}=\frac{1}{3}\) then the ratio of  \(x\) to  \(y\)  is .________

Question 7:
If \(x\) is directly proportional to \(y\) with the scaling factor is 8, \(z\)  is directly proportional to \(x\) with the scaling factor is 4.
Then \(z\)  is directly proportional to \(y\) with the scaling factor is______ .

Question 8:
The maximum value of \(A=\frac{6}{2.\left(x-3\right)^2+3}\) is .______

Question 10:
Suppose that\(\frac{7-3x}{5}=\frac{y+4}{3}=\frac{6x-y}{5}\) . Find the ratio of \(y\) to \(x\)
Answer: The ratio of \(y\) to \(x\) is .______________-
(write your answer by decimal in simplest form)

3
6 tháng 1 2016

nói thế nói làm gì bạn ơi

6 tháng 1 2016

you may also be investigated google it.

Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50. Alzheimer's disease impairs a person's ability to recall memories, both distant and as recent as a few hours before. Although there is not yet a cure for the illness, there may be hope for a cure with a protein called nerve growth factor. The protein is produced by nerve cells in the same region of the brain where Alzheimer's...
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Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.

Alzheimer's disease impairs a person's ability to recall memories, both distant and as recent as a few hours before. Although there is not yet a cure for the illness, there may be hope for a cure with a protein called nerve growth factor. The protein is produced by nerve cells in the same region of the brain where Alzheimer's occurs. Based on this relationship, scientists from the University of Lund in Sweden and the University of California at San Diego designed an experiment to test whether doses of nerve growth factor could reverse the effects of memory loss caused by Alzheimer's. Using a group of rats with impaired memory, the scientists gave half of the rats doses of nerve growth factor while giving the other half a blood protein as a placebo, thus creating a control group. At the end of the four-week test, the rats given the nerve growth factor performed equally to rats with normal memory abilities. While the experiments do not show that nerve growth factor can stop the general process of deterioration caused by Alzheimer's, they do show potential as a means to slowing the process significantly.

According to the passage, where is nerve growth factor produced in the body?

A. In nerve cells in the spinal column

B. In red blood cells in the circulatory system

C. In nerve cells in the brain    

D. In the pituitary gland

1
29 tháng 4 2017

Đáp án D
Thông tin ở đoạn 1: “Until the 1600s, English was, for the most part, spoken only in England…”

Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50. Alzheimer's disease impairs a person's ability to recall memories, both distant and as recent as a few hours before. Although there is not yet a cure for the illness, there may be hope for a cure with a protein called nerve growth factor. The protein is produced by nerve cells in the same region of the brain where Alzheimer's...
Đọc tiếp

Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.

Alzheimer's disease impairs a person's ability to recall memories, both distant and as recent as a few hours before. Although there is not yet a cure for the illness, there may be hope for a cure with a protein called nerve growth factor. The protein is produced by nerve cells in the same region of the brain where Alzheimer's occurs. Based on this relationship, scientists from the University of Lund in Sweden and the University of California at San Diego designed an experiment to test whether doses of nerve growth factor could reverse the effects of memory loss caused by Alzheimer's. Using a group of rats with impaired memory, the scientists gave half of the rats doses of nerve growth factor while giving the other half a blood protein as a placebo, thus creating a control group. At the end of the four-week test, the rats given the nerve growth factor performed equally to rats with normal memory abilities. While the experiments do not show that nerve growth factor can stop the general process of deterioration caused by Alzheimer's, they do show potential as a means to slowing the process significantly.

The relationship between nerve growth factor and a protein is similar to the relationship between Alzheimer's and ______.

A. forgetfulness    

B. a disease 

C. a cure     

D. a cancer

1
9 tháng 11 2017

Đáp án C
Thông tin ở đoạn 2: “Today there are more than 700 million English users in the world, and over half of these are nonnative speakers…”

Fill in the blank with the suitable number (Note: write decimal number with "the dot" between number part and fraction part. Example: 0.5)Question 1:Given .Calculate: .Question 2:Given two triangles  and .If  and  then .Question 3:Suppose that  is directly proportional to  with the scaling factor is .If  and  then k=.Question 4:In this figure, find the value of ?Answer: .(write your answer by decimal in simplest form)Question 5:Find the value of ?Answer: .(write your answer by decimal in...
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Fill in the blank with the suitable number (Note: write decimal number with "the dot" between number part and fraction part. Example: 0.5)

Question 1:
Given .
Calculate: .

Question 2:
Given two triangles  and .
If  and  then .

Question 3:
Suppose that  is directly proportional to  with the scaling factor is .
If  and  then k=.

Question 4:

In this figure, find the value of ?
Answer: .
(write your answer by decimal in simplest form)

Question 5:

Find the value of ?
Answer: .
(write your answer by decimal in simplest form)

Question 6:
Given two triangles  and .
If  and  then the perimeter of  is .

Question 7:

In this figure, .

Question 8:

The value of .
(write your answer by decimal in simplest form)

Question 9:
The perimeter of a triangle is  and the sides of its are in a ratio of .
Then the sides's length of the triangle are .
(write your answer from least to greatest and used ";")

Question 10:

Fill the suitable number in the "?".
Answer: .

 

 

 

giúp mik vs nha please

1
19 tháng 7 2016

đề cho kiểu này thì ông nội nó làm