Primary school textbook People's Education Edition exercises all the answers to the first volume of fourth-grade mathematics on page 25 and 9 questions.

Primary school textbooks People's Education Edition all practice fourth-grade mathematics volume I answer 25 pages, 9 questions, 3 7 6.

× 9 5

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1 8 8 0

3 3 9 4

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3 5 9 2 0

When there is a thrust F, the object is subjected to gravity mg, supporting force F, thrust F and sliding friction F+0.

Orthogonal decomposition method is used to decompose horizontal and vertical forces.

There are f branches in the vertical direction, 1 = mg+f * sin 37 degrees.

In the horizontal direction, F*cos37 degrees -F 1 = M * a 1, and a 1 is the acceleration.

And f 1 = u * f branch 1.

F*cos37 degrees -u * (mg+f * sin 37 degrees) = m * a 1.

10 * 0.8-0.2 *(2 * 10+ 10 * 0.6)= 2 * a 1

a 1= 1.4 m/s^2

When the acceleration time of the object is t 1 = 5 seconds, the speed is v = a1* t1=1.4 * 5 = 7m/s.

The displacement in the accelerated movement stage is s1= a1* t12/2 =1.4 * 52/2 =17.5m..

After the thrust f is removed, the object is subjected to gravity mg, supporting force F and sliding friction f2.

Let the acceleration be a2.

Get F2 = m * a2.

F2 = u * f branch 2 = u * mg

So a2 = u * g = 0.2 * 10 = 2m/s 2.

The displacement in the deceleration stage is set to S2,

It is 0 = v 2-2 * a2 * S2.

Get 0 = 7 2-2 * 2 * S2.

S2 =12.25m.

The total displacement is s = s1+S2 =17.5+12.25 = 29.75m.

The primary school textbook People's Education Edition comprehensively practices the fourth grade Chinese volume I, page 60, page 6 1. The topic is:

1. Read and find the words in the following groups that do not belong to the same category, and draw "-"below.

1. Space rice, space cucumber, space travel and space tomato

2. High yield, bad smell, good quality and strong vitality.

3. Scientists, educators and revolutionaries

4. Cucumber, pumpkin, watermelon and bitter gourd

5. Rice, wheat, pepper and sorghum

Two. After reading the text, fill in the characteristics of these vegetables.

Space gourd-()

Space Chili-()

Space cucumber-()

Three. Think about it and do it.

Travel () experience of passenger () of ()

The change of the sky () and the use of ()

Four. What are the effects of space vegetables on human scientific research?

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Five. If you are one of these "special passengers on the spaceship", can you tell us a wonderful space trip or a later story? Please expand your imagination and tell the story of "you".

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I am too tired to type.

The answer to the first volume of the fourth grade primary school mathematics published by People's Education Press-What do you want to ask? Mathematics teaching in all public primary schools is carried out in accordance with the requirements of the national syllabus, so students should study hard and do their own homework.

People's education printing plate fourth grade mathematics first volume teaching plan 1, fill in the blanks. (15)

1, 82 tens are (), and 90000 has () tens.

2.480956 is (), and the highest bit is ().

3,800,000, 7,000,61(), pronounced ().

4. The two numbers adjacent to 78099 are () and ().

5. Serial number: 76890 24508 136780.

6. The number 1 more than the maximum six digits is (). The smallest seven digits are ().

7. Dividend = () × () Subtraction = ()-()

8.a factor = () ⊙ (). The minuend = ()+().

9. Make up two zeros and three threes. The number that reads only a 0 is ().

Second, judge. Mark "√" in () correctly and "×" in error (5 points).

1, 109876≈65438+ million. ( )。

Give five people a pear, and each person will eat one fifth. ( )

32,800 can be written as 280,000. ( )

4. When 26()38 1≈270000, () can be 1, 2,3. ( )

5. When reading 5000500, read only one 0. ( )

Third, use fractions to express or color. (4 points) (34 points)

Four, calculation (40 points)

1, oral calculation. (10)

3800+800= 790+250= 260-70= 1500+600=

190+580= 638- 199= 25 × 16= 125 ×20=

2800÷700= 1500÷30= 490÷70 = 130×50=

80× (76-69) = 6400 ÷ 80× 7 =125×16 = The reason is that the teaching plan of the first volume of the fourth grade mathematics published by People's Education Press is relatively easy to find, and it is not too difficult to find it now. Regarding the specific teaching plan of the first volume of fourth-grade mathematics published by PEP, I suggest you go here and have a look at the teaching plan of the first volume of fourth-grade mathematics published by PEP. The reason why the teaching plan of the first volume of the fourth grade mathematics in the People's Education Edition here is relatively complete is that the teaching plan of the first volume of the fourth grade mathematics in other places may not be as comprehensive as the People's Education Edition here. Determine where to find the PEP version of the first volume of the fourth grade mathematics teaching plan, because it is easy to find. Thank you for finding the concrete teaching plan of the fourth grade mathematics in People's Education Edition!

Primary school teaching plan Ebert teacher network has everything.

Teachers in our school all use this website.

It is difficult to find the answers in specific reference books on the Internet, and you can't find the answers on the Internet.

It's good for you to think more and not discuss it with your classmates.

Can't you do the second question on page 50 of the first volume of fourth grade mathematics published by People's Education Press?

After the answer of the first volume of mathematics learning and evaluation in the fourth grade of primary school is multiplied by 0.9, a decimal number appears, and the leaves are green, flowers and red, indicating that the leaves are not equal to 0.

Four digits became three digits.

So red = 1. If red is greater than 1, multiply it by 0.9 and it becomes four digits.

Similarly, flower = 1 or flower =0.

1 flowers and green leaves *0.9= green flowers. 1 means leaves =9.

If the flower = 1, then1/green 9 *0.9=9 green 1. 1 no solution.

If the flower =0, then 10 green 9* 0.9= 9 green 0. 1.

Green =8

So red flowers and green leaves represent 1089 respectively.

Thank you. Please adopt it.

People's education printing plate fourth grade mathematics volume I midterm examination paper answer fourth grade mathematics volume I

Class Name: Grade:

I. Oral calculation: (***6 points, separate volume)