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If a cube with an edge length of 2 times 10 ^ 3 expands at a speed of 102 times the volume per second under the action of a certain material, the volume of the cube after 10 seconds can be calculated. It will recover in 20 minutes,
2 times 10 ^ 3 times 102 ^ 10 = 24379883998951426048000
The absolute value problem in the seventh grade of Tianfu mathematics volume 1
If I a i = 4, I B I = 3, and a < B, find the values of a and B
Because the absolute value of a is greater than that of B, and a is less than B, then a is negative
So a is - 4
B can be 3 or - 3, both of which are larger than - 4
Urgent. Today
Send out the questions
The length of line AB is 6 cm, and the line a'B 'is obtained by translating a cm along the line AB, then AA' + BB '= () cm
Each inner angle of an n-polygon is equal to three times the adjacent outer angle, n=_____ .
The length of line AB is 6 cm, and the line a'B 'is obtained by translating a cm along the line AB, then AA' + BB '= 2 cm
As shown in the figure, translate the position of line AB to a ′ B ′ and connect AA ′ and BB ′____________________________ .
The line segments before and after translation are equal: ab = a 'B',
Parallel lines are parallel and equal, or the translation distance of corresponding points is equal: AA '= BB'
If a 10cm long line segment is translated 4cm horizontally, the distance of the midpoint m of the line segment is () cm
Of course, it's still 4cm
Each point on the line is shifted by 4cm
They are a whole
M is always at the midpoint of the line
Let a (- 1,0), B (0,2) be known. Translate the line segment AB so that point B moves to point C (4,4), and then point a moves to point D. ① draw the translated line segment CD, and write down the coordinates of point D. ② if the translation can only move left and right or up and down, describe how line segment AB moves to CD. ③ calculate the swept area in the process of line segment translation
(1) As shown in the figure, D (3,2); (2) the line segment AB is first shifted 4 units to the right, and then 2 units to the upper to obtain the line segment CD; (3) the area obtained is 4 × 2-12 × 1 × 2 × 2 = 6
AA + BB + CC = ABC Q: what's the sum of a, B and C? Note: AA is not the square of a, it's numbers like 33 and 44
AA+BB+CC=ABC
a+b=10
AA+BB+CC=10(a+b+c)+10+c
=100+10(c+1)+c
If C = 9,
A = 2, B = 8, inconsistent
a=1
b=9
c=8
As shown in the figure, in △ ABC, the vertical bisector De of AB intersects AB at point D and BC at point E. if CE = 3cm, the length of be is ()
A. 3cmB. 6cmC. 12cmD. 4cm
∵ in △ ABC, ∵ C = 90 °, ∵ BAC = 60 °, ∵ B = 30 °, ∵ De is the vertical bisector of AB, ∵ AE = be, ∵ BAE = ∵ B = 30 °, ∵ CE = 3cm, ∵ AE = 2ce = 6cm ∵ be = 6cm
Given △ ABC, a (0,1) B (1,0) and | ab | = | BC |, find the trajectory equation of the third vertex C
emergency
|AB|=√2
So | BC | = √ 2
So C is on the circle where B is the center and R = √ 2
(x-1)²+y²=2
The line AB is x + y = 1
ABC is not collinear
Y = 1-x
(x-1)²=1
x=0,x=2
So it is
(x-1)²+y²=2
But excluding (0,1) and (2, - 1)
RELATED INFORMATIONS
- 1. Answers to Tianfu mathematics Issue 8, 2010 In the triangle ABC, the angle BAC = 90 degrees, ad is the height on the BC side, e is a moving point on the BC side (not coincident with points B and C), EF is perpendicular to BC, eg is perpendicular to AC, and the perpendicular foot is f and g respectively (1) Verify eg / ad = CG / CD; (2) When connecting FD and DG, please judge whether FD and DG are vertical? If so, please give proof; (3) Is the triangle FDG isosceles right triangle when AB = AC? Why?
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