Answers to the second unit test paper of Beijing Normal University Edition

Scoring criteria and answers 1, 1, 6, 12, 8, 2, 76, 48, 236, 3, 28, 50, 1280, 4, 5, 12a, 6a, 6, 100, 1, 2, wrong, 2, right 3, wrong 4, wrong 3, 1, B 2, a 3, B 4, C 5, a 4, 1, 288 2, 216 3, 3.52 5, 1, 15.62, 384 3, 27 4, 42

The bottom of a cuboid container is a square with a side length of 60 cm. In the container stands a cuboid iron block with a height of 1 m and a side length of 15 cm. At this time, the water depth in the container is 0.5 m. now lift the iron block up gently for 24 cm. How long is the water soaked part of the iron block above the water surface?

15 × 15 × 24 (60 × 60-15 × 15) = 5400 △ 3375 = 1.6 (CM) 24 + 1.6 = 25.6 (CM) a: the length of the water soaked part on the iron block above the water surface is 25.6 cm

Write five grade midterm mathematics examination reflection, I test 93 points, have to write, fast

At the end of the mid-term exam, I made a lot of mistakes. Looking at the score on the paper, I was surprised. Because this is not the score I really want. Why can't I get higher!
I have analyzed the reasons for this failure. Most of them are due to my carelessness. You often warn us, but I just can't change my carelessness. However, I shouldn't give myself reasons. After my careful reflection, I think it has a lot to do with my carelessness in reading. For example (for example) first of all, I have to get rid of the bad habit of not reading the questions carefully in the exam. Sometimes I often write down the following questions by looking at the front of the questions, but I make a lot of mistakes. In a word, through the later practice, I must carefully review the questions in the process of the exam, learn to read the questions by myself, and look at the questions accurately, Never allow yourself to make such meaningless mistakes again
The key to test skills is practice. After passing the test, I finally understand that mathematics lies in the accumulation and practice of everyday life. On weekdays, we all get together to do the same questions, but we can't feel any obvious difference
I don't do well in this exam. I know I can't forgive it. I have poor self-control in my heart. Sometimes I can't control myself in class. I can't listen to the teacher well and talk to my classmates. I've already reflected on myself. As early as when you just took us, you've already made three orders and five declarations. You've repeatedly stressed that the whole class must study hard and study mathematics seriously, A decimal point is missing here, where 5 is written as 2 When encountering this kind of problem, I always say: "it's careless, it's no big deal!" but why is it careless? It shows that the exercises are too few and not really mastered. Although the concepts are clear, it's useless if they can't be used. So doing more is the best way to solve the problem of carelessness

Yingze District 2008 primary school grade five mathematics volume I mid-term test questions

1. Fill in the blanks: (20 points) 1. 13.5 × 0.5 means: (). 2,0.25 hours = () points; () hours = 2:45,3,5.32727 It's called (), and it can also be written (). 4, 2.1 △ 28 = 2

Among the three external angles of a triangle, there are at most several acute angles and several obtuse angles

One acute angle, three obtuse angles

In a triangle, the degree of one internal angle is equal to twice the sum of the other two internal angles. What triangle is this

If an obtuse triangle exceeds the sum of those two angles, it must exceed 90 degrees. An obtuse triangle is necessary

The sum of the degrees of any two acute angles in an acute triangle must be less than 90 degrees

No, if the problem is set correctly, the sum of the degrees of the three angles of a triangle cannot be 180 degrees

We define a new kind of triangle. The triangle whose sum of squares of two sides is equal to twice the square of the third side is called singular triangle

(1) True proposition (2) two cases: 1 {A2 + B2 = C2; C2 + A2 = 2B2} -------- - A: B: C = radical 2:1: radical 3 (b < a) (rounding off) 2 {A2 + B2 = C2; C2 + B2 = 2A2} -------- - A: B: C = 1: radical 2: radical 3 (3) 1. Prove: because AB is diameter, so ∠ ACB and ∠ ADB are 90 degrees

The sum of the internal angles of a triangle is equal to 180 degrees. It is known that the first internal angle of a triangle is equal to three times of the second internal angle, and the third internal angle is 15 degrees larger than the second internal angle. What is the degree of each angle?

Let the second internal angle be x, the first internal angle be 3x, the third internal angle be x + 15 °, the sum of internal angles of ∵ triangle be 180 °, and the solution be x = 33 °, the first internal angle be 3x = 99 °, the second internal angle be 33 ° and the third internal angle be 48 °

The sum of the internal angles of a triangle is equal to 180 degrees. It is known that the first internal angle of a triangle is equal to three times of the second internal angle, and the third internal angle is 15 degrees larger than the second internal angle. What is the degree of each angle?

Answers to the second unit test paper of Beijing Normal University Edition