(1.5 square+1.5 square +2.2 square) =3.056 14.
That is, the length of the diagonal of the cuboid is the length of the bamboo pole.
Hope to adopt ~ ~! ! ! !
How to do the problem [(5+ 10)+20] on page 29 of the first volume of eighth grade mathematics published by Beijing Normal University?
The first volume of the eighth grade (Beijing Normal University Edition) is a math problem with the root number 2 ≈ 1.4438+04.
Root number 5≈2.235
The multiplication is the root sign 10.
I don't know what it means to ask for this.
There are no books on page 26, question 6 and page 29 1 1, 12 of Pythagorean Theorem of Grade 8 in Beijing Normal University. Is there a problem?
The answer to question 13 of p95 in the first volume of eighth grade mathematics of Beijing Normal University is the root of 2: 3.
Beijing Normal University Edition Grade 8 Volume I 1 Mathematical Pythagorean Theorem Exercise 1.4 Mathematical Pythagorean Theorem: A? +b？ =c？ Give me the topic.
The eighth grade Pythagorean Theorem Exercise of Beijing Normal University Edition 1.3 Volume 1 suggests that you should post the questions in the future, otherwise it is impossible to get the answers to the questions like you do now.
Hello, the Pythagorean Theorem 1. 1 in the eighth grade of Beijing Normal University!
Exercise 1. 1
1.x^2=6^2+8^2
x= 100
x= 10
2.y^2= 13^2-5^2
y= 144，
y= 12。
2, solution, according to Pythagorean theorem: BC? =AB？ -AC? = 17? - 15? =64, so BC=8,
So s △ ABC =/kloc-0 /×15× 8 = 60cm2,
3. The sum of the areas of two larger squares is equal to the area of the largest square, and the sum of the areas of two smaller squares is equal to the area of the largest square.
4. Let CD⊥AB be behind point D and point C,
∵CA=CB=5cm，AB=6㎝，
∴AD=3 cm,
∴CD=√AC？ -Advertising? =√5? -3? =4 cm,
So s △ ABC =1ab× CD = 2 =1× 6× 4 =12cm2.
I hope I can solve your problem.
Grade 8, 4 Mathematics Volume I, Page 8 1 Mathematical Understanding, Questions 4 and 5, Answers. Take a petal as the basic pattern, and rotate around the flower center for 4 times, 72 degrees each time.
5. Take the triangle star as the basic pattern, and rotate it around the center point for 3 times, each time by 90 degrees.
-Did you just learn it here? Well ... both are parties the next day. We have learned page 102.
All right. Anyway. Let's go - -
The eighth grade of Beijing Normal University Edition, the first volume of mathematics, has many teaching plans in its bag;
1, understand the story. Feel the affection between mother rabbit and little rabbit.
2. Develop diffuse thinking and try to express emotions with specific actions and language.
3. Feel the sincere and deep "love" and express it bravely. I can feel the love of my parents and elders and know how to be grateful.
Activity preparation:
Picture book courseware; Story soundtrack; Pictures of the sea, willow, moon and stars, scarves, etc. Hefei word card.