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How much cloth does it take to make a suit One meter means one square meter or something else? Please do me a favor to make a suit,
Normal height between 2.5 and 2.8 meters, length unit
The rectangle in the upper right figure is divided into five squares. The area of the original rectangle is known to be 120cm2. Calculate the length and width of the original rectangle
I've checked the original picture and explained it to you
Let the side length of a small square be 2a, then the side length of a large square = 2A * 3 / 2 = 3A,
The length and width of the original rectangle are 2A * 3 = 6a, 2A + 3A = 5A respectively
therefore
3*(2a)^2+2*(3a)^2=120
12a^2+18a^2=120
30a^2=120
a^2=4
a=2
So the length is 6A = 12cm and the width is 5A = 10cm
Hope it's the same as what you asked for!
What is the axisymmetric figure of 26 letters
Just tell me what the 26 axisymmetric figures are
Which of the 26 letters are axisymmetric figures? If so, what are they
A B C D E H I M O T U V W X Y
A cube wooden box, measure the edge length 62 cm and the wall thickness 1 cm from the outside, and calculate the volume of the wooden box
V = 61 × 61 × 61 = 226981 CC
The proof of Fermat point (in various triangles)
Is pdf format, download down to see, with Acrobat Reader
As shown in the figure, in △ ABC, de ‖ BC, and s △ ade: s quadrilateral bced = 1:2, BC = 26. Find the length of de
∵ s △ ade: s quadrilateral bced = 1:2, s △ ABC = s △ ade + s quadrilateral DBCE, ∵ s △ ade: s △ ABC = 1:3, and ∵ de ‖ BC, ∵ ade ∵ ABC, ∵ s △ ade: s △ ABC = (DEBC) 2, and ∵ BC = 26, ∵ de = 22
When do we usually consider derivative = 0
Well My question is when to consider o when seeking the increasing and decreasing space of a function, because when o is included, it is an increase (decrease) and when o is not included, it is also an increase (decrease)
If you want to include it, do you think it is included in the increase or decrease
If we only seek the increase or decrease interval, we generally need to include the point where the derivative is 0, because this point also satisfies the condition
High school mathematics ellipse and vector problem urgent!
Given that the ellipse and X-axis are orthogonal to point a, (a > b > 0), if there is always point P on the ellipse, so that OP * AP = 0 (o is the origin), find the value range of eccentricity. Note that OP and AP are vectors here
Need to explain the specific process, I forgot all the vectors
Let p be the value of point (x1, Y1)
Point a value (a, 0)
The vector product leads to an equation: X1 ^ 2-ax1-y1 ^ 2 = 0
Point P satisfies the elliptic equation
In order to have a solution, we must have the rational root delta > = 0
Get the relationship between a and B. change B into the relationship between a and C. We can get the value of e. the answer is E > (root 2) / 2
As shown in the figure, △ abd, △ ace are equilateral triangles
It is proved that: ∵ abd, △ ace are equilateral triangles, ∵ AC = AE, ad = ab. ∵ ∵ EAC = ∠ DAB = 60 °, ∵ EAC + ∠ BAC = ∠ DAB + ∠ BAC, i.e. ≌ EAB = ∠ CAD. In △ EAB and △ CAD, AE = AC, ≌ EAB = ∠ CAD, ab = ad, ≌ EAB ≌ CAD. ≌ be = CD
New observation 4 (1-x) - 3 (x-1) - 5 (- x) reduction
guys
4(1-x)-3(x-1)-5(-x)
=4-4x-3x+3+5x
=-2x+7
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