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3x - 3/5 = 2/5.

Solution: 3x=2 5+3 5

3x=1x=1/3

x + one-sixth x = fourteenth of fifteen.

Solution: 7 6x = 14 15

x=14/15×5/7

x=2 3x 4/5 = 28/28 of food.

Solution: x=15 28 4 5

x=3/71.In the school games, athletes need 720 long number bibs, and there are already 5/6 of the number bibs in the storage room, how many number bibs do you need to order to be enough?

It is enough to customize x number bibs.

x+5/6×720=720

x+600=720

x = 120 (sheets).

2.There are 18 students in our class who participated in the composition class, accounting for one-third of the class, and two-ninths of the students who participated in the Olympiad class.

There are x students who participate in the Olympiad class.

x÷2/9=18÷1/3

x÷2/9=54

x=54×2/9

x=12 (name).

3.Dongfeng Machine Tool Factory produced 400 machine tools in April, and increased production by one-fifth in May compared with April.

Set up x sets of machine tools to be produced in May.

x-400)÷400=1/5

x-400=80

x=480 (sets).

4.A total of 120 kilograms of pears, apples, and bananas were shipped from the fruit store, and the mass ratio of pears, apples, and bananas was 3 to 7 to 5.

Pears: 120 3 (3+7+5) = 24 kg.

Apple: 120 7 (3+7+5) = 56 kg.

Bananas: 120 5 (3+7+5) = 40 kg.

5. It has been packed is two-fifths of the total number of candies, and 21 kilograms have been packaged exactly three-quarters of the total number of candies, how many kilograms of this batch of candies are there?

There are a total of x kilograms of candy in this batch.

2/5x+21=3/4x

3/4x-2/5x=21

7/20x=21

x=21÷7/20

x = 60 (kg).

x-3/5=2/5 x=2/5+3/5=5/5=1 x+x/6=14/15

x(1+1/6)=14/15 x=(14/15)*(6/7)=12/15=4/5

x/(4/5)=15/28 x=(15/28)*(4/5) x=3/7

1.You need to buy another number bib of 1-5 6 = 1 6, 720 * (1-5 6) = 720 * 1 6 = 70 meters.

The number of people is the number of people in the class, the number of Olympiad numbers is 54*2 9=12 people, and the overall equation is [18 (1 3)]*2 9=12

Platform. 4.The proportion of pear to the weight of all fruits is 3 (3+7+5)=3 15=1 5, and the weight is 120*1 5=24 kg;

The proportion of apples in the weight of all fruits is 7 (3+7+5)=7 15, and the weight is 120*7 15=56 kg;

The proportion of bananas in the weight of all fruits is 5 (3+7+5)=5 15=1 3, and the weight is 120*1 3=40 kg.

5.The proportion of these 21 kg to the total weight of candy is 3 4-2 5 = 7 20, so the total weight of candy is 21 (7 20) = 21 * 20 7 = 60 kg.

1 Add 3/5 to both sides to become 3x=1 x=3/3.

2 Left x plus 1/6 x = 7/6 x = 14/15 divided by 7/6 x = 4/5.

3. Multiply both sides by four-fifths of the result x = three-fifths of the seventh.

Divide by 6 = 120

Divide by 1/3 = 54 54 times 2/9 = 12

Multiply (1 plus 1/5) = 480

Divide by (3+7+5)=8 Pears: 8 times 3=24 Apples: 8 times 7=56 Bananas: 8 times 5=40

Divide by 3/4 = 28 28 divided by (1-2/5) =

Solution: 3x=2 5+3 5

3x=1x=1/3

Solution: x+1 6 x=14 15

7/6 x=14/15

x=4 5 solution: 5 4 x=15 28

x=3 7 vocabulary questions.

1. Solution: 720-720*5 6=120 (sheets) Answer: 120 number bibs need to be customized.

2. Solution: The whole class has a total of: 18*3=54 (people).

The number of students who participated in the Olympiad class is: 54*2 9=12 (people) Answer: There are 12 students who participate in the Olympiad class.

3. Solution: 400 + 400 * 1 5 = 480 (sets) Answer: 480 machine tools were produced in May.

4. Solution: 3 + 7 + 5 = 15

Pear: 120*3 15=24 (kg).

Apple: 120*7 15=56 (kg).

Banana: 120*5 15=40 (kg).

A: 24 kg of pears, 56 kg of apples, and 40 kg of bananas were shipped.

5. Solution: 21 divided by (3 4-2 5).

21 divided by 7 20

60 (kg).

A: There are 60 kilograms of candy in total.

3. Set x units in May, x-400 = 400 * 1 5 x = 80 + 400 = 480

4. Set pears to be 3x and apples to 7x. 3x+7x+5x=120 x=8 3x=24 5x=40

5. Set a total of x kilograms, 2 5x + 21 = 3 4x 7 20x = 21 x = 60

3x=1 x=1/3

7x/6=14/15 x=4/5

x=15/28×4/5 x=4/5

720-720 5 6 = 120 sheets.

Class size: 18 1 3 = 54.

Number of participants in the Olympiad class: 54 2 9 12 people.

400 400 1 5 = 480 units.

Pears for the total: 1 5

Apples for the total: 7 15

Bananas for the total number: 1 3

Pears are 120 1 5 = 24 kg.

Apples are 120 7 15 = 56 kg.

Bananas are 120 1 3 = 40 kg.

21 (3 4-2 5) = 60 kg.

1/x+1/2x+1/3x

6/6x+3/6x+2/6x

11 6x don't understand welcome to ask, if it helps, thank you!

Total: 4 (1 3) = 12 sticks.

Red: 12 1 6 = 2.

Blue: 12-2-4 = 6 sticks.

A: 2 red pencils and 6 blue pencils.

3).The original formula is obtained: (AC+BC) ABC-(AB+AC) ABC(BC-AB) ABC

c-a)/ac

4) The original formula: 1 (a-1) + 2 (a square-1) (a+1) (a square-1) + 2 (a square-1) (a+3) (a square-1).

=（z-x）/y

2b c can be seen directly, what process is wanted!