The answer to the class assignment in the first volume of eighth grade mathematics is in the triangle ABC, AB = BC.
Ask for class assignments, new curriculum standards, people's education edition, eighth grade mathematics page 143 to 146. Honey, write it yourself.
The answer to the first volume of the eighth grade mathematics textbook is PEP 17 12. Proof: ∫AB∨CF
∴∠ADE=∠CFE (two straight lines are parallel and the internal angles are equal)
∠∠AED =∠CEF (equal to vertex angle)
In delta △AED and delta △CEF.
∠ADE=∠CFE
DE=FE
∠AED=∠CEF
∴△aed?△cef(asa)
∴AE=CE (the corresponding sides of congruent triangles are equal)
The answer in the exercise book of physics class in the first volume of the eighth grade (People's Education Edition) is more than twice the focal length and will not be reversed to enlarge the physical distance less than the focal length.
4. Less than expected
5: Inverted zoom camera
More than 6:3 cm, 15 cm, 30 cm of rain in Mao Mao.
7: Double focal length
Question 8 to 12
I can't do it either 13.
Question 14 to 17
18: zoom in and out
19: the brightest minimum value 10 is less than10cm.
20: No.
2 1: light screen convex lens candle
22: Zoom in up and right
the fourth lesson
1: The focal length is double the focal length.
Step 2 Zoom in and then zoom in
3. Can't be a virtual image at this time.
4:7.5
Questions 5 to 10
1 1: Zoom out, zoom in and stay away from the convex lens.
Question 12 to 19: D
20: Stay away from less than
2 1: s less than f less than 10 can't.
22: Candle convex lens screen flame screen is the same height.
23: (1): large (2): 20 (3): 1: reduce and invert the real image 2: equidistant and invert the real image 3: enlarge and invert the real image. ⑷:D
24:E A AB CD
The fifth category
1: Convex lens inversion reduces the realistic long and short retinas.
2. Thick, strong and concave.
3. Thin, weak and convex.
4: 4 0.25
5. Myopia concave surface
6. Concave myopia
Question 7 to 10: bb bb
1 1: No.
12: touch by hand, parallel focusing method
13:B 14:A 15:ABCD 16:C
17:( 1): cornea and lens retina.
(2) Normal myopia and hyperopia
(3): focusing concave surface
(4): C focal length convex surface
18: (1): convergence and divergence (2): focal length can't diverge (3): small inverted reduction in focal length.
The sixth class
1: convex lens eyepiece objective projector magnifies the object magnifying glass.
2. The camera focal length of the measured object is the same.
3. The greater the viewing angle, the greater the eye viewing angle.
4. Telescope microscope
5. What a bright big party.
6. Become bigger and equal.
7:C 8:C 9:D
10: Telescope is an inverted magnified real image.
1 1:B
12:A
13:ABD
14:B
15:( 1): concave mirror can converge light. (2): It can be used to make solar cookers, searchlights, car lamps and reflectors.
(3): Ask questions, make bold guesses, do experiments and draw conclusions.
It took me two hours to write it, and the last two chapters were written the day after tomorrow. Don't worry, I will write it for fun.
I wish you finish your homework quickly and have fun every day. Liu Tongfa.
Seek complete homework, the first volume of eighth grade mathematics, the answer of Hebei Education Edition. You can find it in the interactive homework.
People's Education Press Eighth Grade Mathematics Teaching Plan Volume I: Wen Ku. Baidu, please. /view/00 BD 0 ea 6 f 524 BF 12 184 a 0。
People's education printing plate eighth grade mathematics first volume "known (x+y)?" =25，(x-y)？ =9, find xy and x? +y？ "The value of that question?
∵(x+y)？ =25,
∴x？ +2xy+y？ =25,
Similarly, x? -2xy+y？ =9,
∴4xy= 16,xy=4
Replace x with xy=4? +2xy+y？ =25,
Do an x-ray +y？ =25-2×4
x？ +y？ =25-8= 17
So xy=4, x? +y？ = 17
20 17 Exercise Book History Eighth Grade People's Education Edition Volume I Answers The exercises have answers, but they are all.
After I completely answered the question, I was right.
I didn't copy the answer, that's all.
It's not good to fry some super-self-protected fruits. Read more books.
I hope I can help you, please adopt the correct answer.
Your praise or adoption is my motivation to continue to help others.
The answers to all the exercises in the first volume of eighth grade mathematics of People's Education Press: People's Education Press ../czsx/jszx/czsxtbjxzy/czsxdzkb _1/czsxdzkb7s _1_1/