Elementary School Mathematics Process, Primary School Mathematics Process to Process

216 4 = 54 decimeters (because the cuboid is composed of 4 high, wide and long) (this equation means 1 long, 1 high and 1 wide).

4+3+2=9 You can divide 1 long, one high and one wide, and divide it into 9 parts equally.

54 9 4 = 24 decimeters.

54 9 3 = 18 decimeters.

54 9 2 = 12 decimeters.

24 18 12 = 5184 cubic decimeters (volume) If you can, please choose a satisfactory answer, if you still have questions, you can continue to ask, thank you. You must choose me, I worked so hard!!

To know their volume, you need to know how long they are, how wide and high they are.

Then you can column 216 [4 (4+3+2)] = 216 4 9 = 96dm and the length is 96dm

216 [3 (4+3+2)] = 216 1 3 (this is the fraction of 3 9) = 72dm wide is 72dm

216 [2 (4+3+2)] = 216 2 9 = 48dm high is 48dm

Volume formula v=abh

So) the volume is 96 72 48 = 6912 48 = 331776dm Answer: The volume of the cuboid is 331776dm

216 4 = 54 decimeters.

54 9 4 = 24 decimeters.

54 9 3 = 18 decimeters.

54 9 2 = 12 decimeters.

24 18 12 = 5184 cubic decimeters.

4+3+2=9:::216 Divided by 9=24 (one is 24), 4 to 3 to 2 = 4 times 24 plus 3 times 24 plus 2 times 24,,, answer is 96 to 72 to 48

20 meters = 2000 centimeters.

The bricks required to lay one side are: 2000 50 = 40 (blocks) The bricks required to lay the four sides of the square are: 40 4 = 160 (blocks), and the distance between AB is 9x, then the distance between AC is 10x, and the ratio of the distance traveled by car B to the rest of the distance is 1:

3 then the remaining distance of car B is 10x 3 4=15x 2

The remaining distance of car A is: 9x-60

Based on the fact that the distance between the two trains and the destination is equal, we get: 9x-60=15x2 and solve x=40

The AC distance is: 10x=10 40=400 (km) with a total of x dormitories.

Constant number of people: 2x+14=3x-2

Solve x=16

The number of representatives is: 16 2 + 14 = 46 (people).

So: there are 16 dormitories representing 46 people.

Let B take x days to complete alone, C will take y days to complete alone, and the total amount of the project will be set to the unit "1".

Then B's work efficiency is 1 x C's work efficiency is 1 y, according to the title: 1 72 (1+2+4)+1 x (2+4)+1 y 4=1 3

1 3 + 8 (1 72 + 1 x + 1 y) = 5 6 Simultaneous equations Solve x = 48 y = 36

So: C's work efficiency is: 1 y=1 36

The remaining amount of work is 1 6

Then the required working time is: 1 6 1 36 = 6 (days).

Question 1 80

Question 2: 150 km.

The third question has a total of 16 dormitories, representing a total of 46 people.

Question 5: 6 days.

Set to x y=4 5

x=4/5y

x-124=4/9(y-135)

4/5y-124=4/9y-60

(36-20)/45y=124-60

16/45y=64

y=180>x=144

So this score is 180 144

Also 1, x y=4 5

2, (x-124) (y-135)=4 9 syntactic x,y

The obtained x,y must satisfy: x>124,y>135 is the result.

Solution: The numerator is 4x, and the denominator is 5x

4x-124）／（5x-11）=4／9

Solution x=67

So the original score is: (4x67) (5x67)=268 335

Let the original fraction be: 4x 5x then there is:

4x-124)/(5x-11)=4/9

36x-1116=20x-44

36x-20x=1116-44

16x=1072

x=67 so the original score is: (4x67) (5x67)=268 335

Let the original score be 4x 5x

Then the current one is (4x-124) (5x-11)(4x-124) (5x-11)=4 9

36x-1116=20x-44

16x=1072

x = 67 and the original score was 268 335

Because if the original fraction is: 4x 5x, then there is:

4x-124)/(5x-11)=4/9

36x-1116=20x-44

16x=1072

x=67So: (4x67) (5x67)=268 335

Question 1: If you plan to produce Y refrigerators, then [3 5)+(5 8)]*Y=Y+360 will get 1600 units.

Question 2: If A, B, and C donate books a, b, and c, then a (b c) 3, b (a c) 2, c 400 are combined from the above forms to obtain a 240, b 320, so a b c 240 320 400 960

1.Set the plan to be X-set.

Then x3 5 x5 8 x 360, the solution is x=16002Let B purchase the book as x

Then (x+400)+(x+400)1 3 x+2x solves x=320, and A's book = (320+400)1 3=240 total = 240 + 320 + 400 = 960

(3 5 + 5 8-1) = 1600 (sets) 2, set a x book, B y book.

3x=y+400

2y=x+400

x = 240y = 320, that is, x + y + 400 = 960 (this).

The bottom circumference is dressed up to fight 20*

The high is 628

However, after knowing the silver stove, use cubic centimeters.

Take away a box and reduce the area of one or one side of the shirt carefully, then the high skin trap = 628 (2pai*10) = 100

then volume = pai * 10 * 10 * 100 = 31400 cubic centimeters.

1: Each girl can get 20 books, which means that each girl can get 8 more books, then each girl gets 8 books, exactly 12 copies for each boy, so the ratio of girls to boys is 12 to 8 is 3 to 2, then the ratio of girls to books to boys is 2 to 3, so 30 books for each boy.

2: Set the total budget to be 1, then the original ** is 1 60, and the current ** is 1 60 * 75% = 1 80, so now you can buy 80 units.

The number of units bought and the unit price are inversely proportional, so ** is 75% of the original, the original number of units is 75% of the current one, and the current number of units = 60 75% = 80

1 If there are z people in the class and x girls in the class, then 12z=20x z=5 3 x if there are y boys, then y=2 3 x let the boys send a, then ay=20x bring y=2 3 x in.

a=30 i.e. 30 copies.

2 Solution 1 Let the original price x be the current price.

Now you can buy a unit then 60x= a=80 units Solution 2 let you buy x now then 60: x= x=60 units.

The total number of books set is 1

1 (1 12-1 20) = 30 Boys can be given 30 copies per person, with women x and girls y.

12（x+y）=20x x=3/2x

Boys are given 20x y=30 each

It is estimated that it will cost 1 to set up a school

Then the computer ** 1 60, now 1 60 75%.

then buy a total of 1 (1 60 75%) = 80

Previously you could buy 60 units, now you can buy 60 units and save 60 units (1-75%), and buy one unit for 75%.

You can buy 60 more 25% 75% = 20

then buy a total of 20 + 60 = 80

1: There is a batch of books in the sixth grade class, and the whole class has just finished distributing 12 books. If it is only given to girls, there will be 20 copies per person. Q: If it is only distributed to boys, how many copies can be distributed per person?

Number of girls * 12 + number of boys * 12 = number of girls * 20 number of boys * 12 = number of girls * 8

Number of boys = number of girls * 2 3

Distributed to boys only = total number of books Number of boys = number of girls * 20 (number of girls * 2 3) = 30 copies.

If it is only given to boys, 30 copies can be distributed per person.

2: The school wants to buy a batch of computers, the original plan was to buy 60 computers, and now the price of computers has been reduced, each is only 75% of the previous one, ask how many computers can be bought now? (2 methods to solve, one of which is proportional).

Method 1: 60: Computers can be bought now = 100:75 Computers can be purchased now = 80 units.

Method 2: 60 * original ** = 60 * 75% * original *** can now buy computers = 80 units.

Question 1: Number of boys x Number of girls y

x+y)*12=20y 12 books per person just after distribution = 20 books per girl = total number of books.

12x+12y=20y

12x =8y

12x*20 8 = 8y*20 8 Multiply 20 8 on both sides of the equation, and make the right side of the equation 20y, that is, girls have 20 books each.

30x = 20y

The answer is that boys can give out 30 copies each.

The second question, solution 1: each computer is only 75% of the previous one, indicating that each computer saves 25%, and three computers save one computer 25% * 3 = 75%, so 60 3 + 60 = 80 units.

Solution 2: Set ** to p, and now you can buy a total of x units.

60p=xp*75%

60=3/4x

x=80

Male + Female) = 20 * Female.

So 12 males = 8 females.

3 males = 2 females.

So 20 females = 30 males, that is to say, 30 for each male 2The first type (proportional) is designed to buy X units.

60:x=:1

x=80

The second kind 60

1.There are x girls and y boys. 12(x+y)=20x, then 12y=8x; 3y=2x;30y=20x.So boys can get 30 copies each. Platform.