What to do in section 6? There should be columnar forms.

In sheet music, it is common to see a long vertical line between several notes, which we call a bar line. The notes in the bar line are combined according to a certain law of strength and weakness, and this combination constitutes the beat. Generally, there are beats marked in the upper left corner of the score, such as 2 4, 4 4, etc., which is called the beat number.

Commonly used beats are as follows: 2 4 beats, with quarter notes in one beat, two beats per measure. The first beat is strong, the second beat is weak.

4 4 beats, in quarter note beats, four beats per measure. The first beat is strong, the second beat is weak, the third beat is second strong, and the fourth beat is weak. 3 4 beats, in quarter note beats, three beats per measure.

The first beat is strong, the first.

The second and third beats are weak.

From this, it can be concluded that regardless of the beat, the first beat after the bar line is always a downbeat, and the beat before the bar line is always a weak beat.

The beats of the music are varied, in addition to the above, there are 2 2 beats, half notes are one beat, and each measure is two beats. 3 8 beats, eighth notes in one beat, three beats per measure. 6 8 beats, eighth notes in one beat, six beats per measure.

6 in 4 beats, quarter notes in one beat, six beats per measure. 5 8 beats, eighth notes in one beat, five beats per measure. 12 8 beats, eighths of notes in one beat, twelve beats per measure.

As long as we master the above basic beat forms, the rest is not difficult to master. There is also a special kind of beat called the loose beat, also called the free beat, which generally does not draw a small beat, and the speed and urgency are also mastered by the singer and the performer according to their own understanding of the music.

If you can't write it, you can wrap the line and move it to the next line, and the notes on the previous line will be separated by a little distance, and it will look comfortable. Or the distance between the line is tightened, and there is no space between the notes and the bar line, which can also shorten the distance and accommodate a few more notes.

One. Write the number after the equation.

1/2 1/3 = 1/6 1/2 + 1/3 = 5/6

1/2-1/3 = 1/6 1/2 1/3 1 = 3/2

1/5 1/6 = 6/5 3/4 9 = 1/12

1/12 1/3 = 1/4 10 5/7 = 14

1/2 7 = 1/14 1 1 1/15 = 15 0 1/8 = 0 2/3 18 = 12

Two. Do the math (writing process).

9/13 6

9/13 1/6

3/36/521 10/7

5/21 7/10

15/14 out of 6 5/8

15/4 8/5

11/620 22 10/3

11/20 1/22 10/3

1/40 10/3

1/15/12 3/4 1/6

1/5 4/3 6

1 out of 5 8

86/5 2/9 1/3

6 2/9 3

18 2/9

4 iii. Fill it out.

1.There are a number of male students who participate in extracurricular activities, and the number of female students is 6 times less than that of male students. There are (people) for girls, and there are (people) for those who participate in extracurricular activities.

2/2 m = (40) cm 1/4 m2 = (25) sq dm.

63 cubic centimeters = (or 63/1000) cubic decimeters 125 milliliters = (or 1/8) liters.

liter = (cubic decimeter = (1050) cubic centimeter.

3.The edge length of a cube is 2/5 of a decimeter. Its surface area is (24/25 square decimeter) and its volume is (8/125 cubic decimeter).

2/3 of 3/3 is (1/2) and 2/3 of (9/8) is 3/4

The reciprocal of 7 out of 8 is (8 out of 7) and the reciprocal of (1 out of 5) is 5

5.Class 6 (1) selected 5 students with three merits, accounting for 1/9 of the total class size. There were 45 students in the class.

6.The school has 45 soccer balls, and the number of basketballs is two-ninths more than that of soccer balls. There are (10) more basketballs than footballs.

7.A rectangular glass box with water, measured from the inside, the bottom area is square meters. After some more water, the water surface rose by 5 centimeters, and (30) liters of water were poured in.

8.Fill in the brackets with the appropriate units.

1) The floor area of a classroom is about 60 (square meters).

2) The net content of a bottle of drink is about 800 (ml).

3) The volume of a cuboid fish tank is about 600 (liters).

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The grass and mud horses are more than the king's eight raising.

1.(1) 3/4 = 6 (8) = (9) 12 = 15 (20) = 24/24 (18).

2) The ratio of a ratio is 21/5. If the former term is enlarged by a factor of 3, the latter term should be (expanded by a factor of 3) to keep the ratio constant

3) The ratio of a ratio is 5/12. If its last term is 48, the previous term is (20).

2.Simplify the following ratios (write out the process).

7/8 3/4

7/8) :(3/4 8).

4 4/7

4 7) (4 out of 7 7).

34/51 = 2/3 (about 17).

3.A peanut kernel, 600 kg can be squeezed out of 240 kg of peanut oil. Write down the weight ratio of peanut oil to peanut kernels and simplify it.

Solution] 240:600=2:5

4.For a pesticide, 2500 ml of water should be added for every 50 ml of liquid medicine. Write down the volume ratio of the potion to the potion and simplify it.

Solution] 50 ml of liquid medicine, 50 + 2500 = 2550 (ml) is obtained

The volume ratio of liquid medicine to liquid medicine is: 50:2550=1:51

5.Three-fifths of the boys and nine-fifths of the girls are equal. The ratio of the number of men to women in this class is ().

Solution: 3/5 of the number of boys = 9/10 of the number of girls

So: number of boys = number of girls 9/10 3/5

So, the number of boys = 3/2 of the number of girls

So the ratio of male to female students in this class is (3) (2).

6..Filling.

First line: 20, 20:1

Second line: 25:6, 6/25

Third line: 3:4, 3/4