How to solve the equation of X ratio 6 = 5? There is still 5 out of 8 ratio x = 25 out of 16

How to solve the equation of X ratio 6 = 5? There is still 5 out of 8 ratio x = 25 out of 16

x:6=5
x=5×6
x=30
5/8：x=25/16
x=5/8÷25/16
x=5/8×16/25
x=2/5

How to solve the equation of 0.4 divided by (4-x) = 14

The original formula is equivalent to 2 / 5 = 14 (4-x)
SO 2 / 70 = 4-x
That is, 1 / 35-4 = - X
So x = 4-1 / 35
x=139/35
The top 1 / 35 is 1 divided by 35

English 50 word speech on dreams

Everyone has a dream.
Now I want to say something about my dream.What is my dream?I often ask myself.In my mind,everyone shall have his own dream.I think that having a dream means that we have an idea,and then we will do all the things to achieve the target.As long as we have a goal to be realized,we won’t be blind at least.
My dream is to become a successful doctor,helping those sick people and saving their lives.Of course,to be a good doctor is very difficult,but I will do whatever I can do to keep everyone healthy.That 's my dream.I want to try my best to help the poor sick people of our country.I want to let them have an opportunity to receive excellent treatments for their illnesses without having to pay much or just enjoy them free.China is a developing country which needs good medicine and good doctors,especially in the countryside and distant villages.
Now I’m a junior student on Grade One,all my classmates and I are working hard.We all know that the entrance exam of high schools coming in the year of 2009 is a big challenge for us,so we must study harder and harder in order to go to a good high school.Thus after we finish our senior high school,we are able to go to a good university.Finally , we can find a good job in society.
My dream is also that although at present I’m good at study,I’ll still try my best to be the study winner.Now everything I do is close to my dream.I feel life is fill with hope and is colorful,and I have enough confidence to realize my dream.
I know that fantasy is something hard to realize, but dream can. I'll work hard for my dreams, I'll never give up

In the known plane rectangular coordinate system, the coordinates of three points of triangle ABC are divided into a (- 5,0) B (- 4,3) C (- 3,3). (1) if point e starts from point C, take every
In the known plane rectangular coordinate system, the coordinate of three points of triangle ABC is divided into a (- 5,0) B (- 4,3) C (- 3,3). If point e starts from point C and moves to the ray BC at the speed of 1 unit length per second, point d starts from point a at the same time and moves along the positive direction of x-axis at the speed of 2 unit length per second, and other points do not move. When point d reaches the origin o, it immediately moves to the negative direction of x-axis at the original speed, The area of the quadrilateral formed by D four points is 12?
After a few seconds, the quadrilateral area of a, B, C and D is 12?

It is known that the quadrilateral ABCD is trapezoid, BC ‖ ad, and the height is 3. Let time T seconds, then BC = 1 + T, ad = 2T (when 2T ≤ 5) or 2t-5 (when 2.5 ≤ t ≤ 5) ‖ s = (1 + T + 2t) / 2 × 3 = 12 or S = (1 + T + 2t-5) / 2 × 3 = 12 ‖ t = 7 / 3 (7 / 3 ≤ 2.5, coincidence) or 4 (2.5 ≤ 4 ≤ 5, coincidence) ‖ when 7 / 3 or 4 seconds

There is a cuboid with a surface area of 184 square centimeters, a bottom area of 20 square centimeters, and a bottom perimeter of 18 centimeters. The cuboid has a volume of______ Cubic centimeter

20 × [(184-20 × 2) △ 18], = 20 × [(184-40) △ 18], = 20 × [144 △ 18], = 20 × 8, = 160 (cubic centimeter). Answer: the volume of this cuboid is 160 cubic centimeter. So the answer is: 160

Given that cosa = 4 / 5 a belongs to (0,2 / π), the value of Tana and sin (π - a) can be obtained
(0,2 / π) is corrected to (0, π / 2)

Cosa = 4 / 5 a belongs to (0,2 / π), Sina = 3 / 5, Tana = Sina / cosa = 3 / 4
sin(π-a)=sina=3/5

It is known that the equation (k-1) x ^ 2 + (2k-3) x + K + 1 = 0 has two unequal real roots X1 and x2
(1) Find the value range of K
(2) Is there a real number k so that the two real roots of the equation are opposite to each other? If so, find out the value of K; if not, explain the reason

1. It can be concluded that if k-1 ≠ 0, then K ≠ 1
△=（2k-3）²-4（k-1）（k+1）=4k²-12k+9-4k²+4= -12k+13＞0
Then K < 13 / 12 and K ≠ 1
2. According to Weida's theorem:
x1+x2= -（2k-3）/（k-1）=0
Then: - (2k-3) = k-1
3k=2
k=2/3

Let f (x) be an odd function defined on R

When x = 0, f (x) = - X & # 178;
4f (x + T) is to shift f (x) to the left in t units, and multiply the ordinate by 4
No intersection f (x) > 4f (x + T) holds when x0
So t + 2 ≤ - 2T
t≤-2/3

Who can solve 20-10x = 4 + 6x

20-10X=4+6X
The result is 20-4 = 10x + 4x
That is, 16x = 16
So x = 1

The sum of the distances from any point of an ellipse to two focal points is 10, and one focal point coordinate is F1 (0, - 3)
Who knows,

According to the definition of ellipse, 2A = 10, a = 5
The equation of the ellipse can not be solved, because we don't know whether the major axis and minor axis coincide with the coordinate axis, or whether the center of the ellipse coincides with the origin. If we don't know these, we can't do it. The ellipse is not unique
If these points are satisfied, then C = 3, B = 4, the focus of the ellipse is on the y-axis
y^2/5^2+x^2/4^2=1