All definitions of 3 and 6th grade in elementary school mathematics textbook, people teach

Sorry, it's too troublesome to find a grade of mathematics in the human education version, although I found it,

The concept of numbers.

Concepts in terms of operations.

The concept of the relational aspect of numbers.

The concept of quantitative measurement.

Concepts in terms of geometric shapes.

Concepts in terms of ratio and proportion.

Concepts in terms of basic knowledge of algebra.

Concepts in probability and statistics.

Set the goods in warehouse A as x

When 7/15 of the goods in warehouse A are removed

Inventory items left in warehouse A x (1-7 15).

Take 1 10 x (1-7 15) (1-1 10) B warehouse 1200

Take 1 3 and leave 1200 * (1-1 3) = 800 plus 1 10 of A

is a lack of rock 800+x*(1-7 15)*1 10, then x(1-7 15)(1-1 10)=800+x*(1-7 15)*1 10

Solution: x = 1875 tons.

Solution: The original goods of the first warehouse are x tons of lead.

x (1-7 15) (1-1 10) = 1200 (1-1 3) + x (1-7 15) 1 and 10

x×8/15×9/10=800+x×8/15×1/1012/25x-4/75x=800

32/75x=800

x=800 32 with 75

x=1875

Answer: The original goods in warehouse A were 1,875 tons.

The main purpose of this question is to grasp the change of unit "1".

The original cargo of the warehouse was X tons.

then 1200 (1-1 3) = (1-7 15) x

x = Hudan....

11. Set up a team to repair an average of x meters per day. According to the meaning of the question, 20x=12 (x+40) solves x=60 Answer: omitted.

12. According to "the number of students in the third class is one eleventh more than that in the second class, if the number of people in the third class is the same as the number of people in the second class after transferring 4 people", the number of people in the second class = 4 1 11 = 44 (people), then the number of students in the third class = 44 + 4 = 48 (people), and the total number of students in the fifth grade = (44 + 48) (1-10 33) = 92 33 23 = 132 (people).

13. The sum of the speed of A and B = 41 kilometers 4 hours and 15 minutes = 164 17 kilometers and hours.

The difference between the speed of A and B is 1 hour 45 minutes 4 hours 15 minutes = 7 17

So B speed = 164 17 kmh (2+7 17) = 4 (kmh).

The distance between a and b = 4 1 hour and 45 minutes = 7 (km).

14. Set the height to h decimeters. According to the meaning of the question, 1 is solved, and h=8

So the volume of the cylindrical container = cubic decimeters.

15. It seems that the conditions are insufficient.

11. Total road length: 40 (1 12 — 1 20) = 1200 (m) A daily average repair: 1200 20 60 (m).

12. Number of people in the second shift: 4 1 11 = 44 (people) Number of people in the third class: 44 + 4 = 48 (people).

Number of fifth graders: (44+48) 1- 10 33) = 132 (15 = hours, 1:45 = hours.

time) is a certain distance, and the time ratio between A and B is::6 = 17:24 Then, the time is certain, and the distance ratio between A and B is 24:1724+17=41

The distance of line A is the distance between A and B: 41x24 41=24 (km) 14, and the height is set to h decimeters. According to the meaning of the question, 1 solution is h=8, so the volume of the cylindrical container = cubic decimeters.

15.The quality of a barrel of oil is equivalent to 120% of that of a second barrel of oil.

The mass ratio of the oil used in barrel A to the oil left in barrel B is 2 to 3At this time, the remaining oil of the two barrels is the same weight, and the remaining oil of the second barrel is the same as the remaining oil of the first barrel, so the ratio of the oil used by the first barrel to the remaining oil of the first barrel is 2:3

Bucket A has 120% of Bucket B left 3 (2+3)=18 25.

Barrel B left 18 25 of barrel B. The oil in a bucket is 21 (1-18 25) = 75 (kg).

A bucket has 75 120% = 90 (kg).

Calculation: 36 kg was used for barrel A, 21 kg was used for barrel B, and 54 kg was left. 36:54=2:3

11. Total road length: 40 (1 12 — 1 20) = 1200 (m) A daily average repair: 1200 20 60 (m) A:

Team A repairs an average of 60 meters per day 12, the number of people in the second shift: 4 1 11 = 44 (people) the number of people in the third shift: 44 + 4 = 48 (people).

Number of students in grade 5: (44+48) 1- 10 33) = 132 (person) Answer: There are 132 students in grade 5.

15 minutes = hours, 1:45 minutes = hours.

time) is a certain distance, and the time ratio between A and B is::6 = 17:24 Then, the time is certain, and the distance ratio between A and B is 24:1724+17=41

The distance of line A is the distance between A and B: 41x24 41=24 (km) Answer: The distance between A and B is 24 km.

14.No.

15.No.

The upper bottom of a trapezoid is 1 3 meters, the lower bottom is 2 3 meters, and the height is 9 10 meters.

9 20 (sq.m.).

The area of this trapezoid is 9, 20 square meters.

Six years on the volume.

1. Position (use pairs of numbers to represent the position of objects in a specific situation; Determine the position of an object on graph paper with pairs of numbers. ）

2. Fractional multiplication (fractional multiplication; The law of integer multiplication is generalized to fractional multiplication; The practical problem of finding out what fractions of a number are; Reciprocal. )

3. Fraction division (fractional division; Knowing what fractions of a number are, the practical problem of finding this number; the meaning of ratio, the relationship between ratio and fraction and division, the basic properties of ratio, simplifying ratio and finding ratio; Apply the knowledge of the ratio to solve practical problems related to it. )

4. Circle (Characteristics of a circle; Draw a circle; Pi; Calculation of the circumference and area of the circle) to determine the starting line.

5. Percentages (the meaning of percentages, reading and writing; reciprocal decimals, fractions, and percentages; the meaning and simple calculation of discounts, taxes, and interest; ）

6. Statistics (Sector Chart) Reasonable deposits.

7. Mathematics wide angle (chickens and rabbits in the same cage).

8. Total review.