The math genius in the sixth grade came and told me these questions.

Question 1: 1/15 2/15 3/15 4/15 5/15 6/15 6/15 7/15 8/15 9/15 11/15 12/15 13/15 14/15 = 21/3.

Question 2: (1) 1 and a quarter = 1 4 + 1 =, (2) 125 (after the decimal is calculated, the decimal point is moved to the right by two squares).

Question 3: 4 7, 10, 11, 15, 7, 18, 33, 16, 15 (divide the numerator by the denominator to determine whether it is a finite decimal).

Finally, how to convert fractions into fractions: integer part Denominator + numerator, the calculated number is the number on the numerator, the denominator is copied, and the integer part is omitted.

For example, one and a quarter = 1 4 + 1 = 5 (numerator) = 5 4

10 3 Add up all the numerators that cannot be divided 1 and 1/4 = ( ) decimal place) = ( 125 )%4 7 10 11 6 5 15 7 18 33 16 15 Among these fractions, the ones that cannot be divided into finite decimals are (all except 6 5 are all explanatory questions) Explanation question Fractional decimal: 1. The integer part with fraction remains unchanged, 2. Divide the true fraction with fraction into a decimal (numerator divided by denominator), 3. Merge the two parts. Typing is tiring, looking.

The minimum true fraction is: 1 15, 2 15, 4 15, 7 15, 8 15, 11 15, 13 15, 14 15, and then add them together to get 4

1 and 1/4 = 5 4, so that, converted to % fraction, the numerator and denominator are multiplied by 100 at the same time to get 125%.

With fractional conversion, the integer part is treated as having a denominator of 1

1. The sum of the simplest true fractions in which the unit of fractions is 1/15 is (4).

The unit of fractions is 1/15, and the simplest true fractions are: 1 15, 2 15, 4 15, 7 15, 8 15, 11 15, 13 15, 14 15

Add them up to 1 15 + 2 15 + 4 15 + 7 15 + 8 15 + 11 15 + 13 15 + 14 15

Another 1/4 = ( ) = ( 125 )%.

1 and 1/4 = 5 4 = 5 4=

7 10 11 6 5 15 7 18 33 16 15 Of these fractions, the ones that cannot be reduced to finite decimals are ( 4 7 10 11 15 7 18 33 16 15 ).

The finite decimal is divisible when the numerator is divided by the denominator. Except for 6 5, all the numbers given are infinitesimal decimals.

Hope it works for you!! o(∩_o~

The sum of fractions in the unit of 1/15 of the simplest true fractions is (4) 1 and 1/4 = ( ) decimal places) = ( 125 )% 4 7 10 11 6 5 15 7 18 33 16 15 Of these fractions, the ones that cannot be reduced to finite decimal numbers are (4 7 10 11 15 7 18 33 16 15).

How to reduce fractions with fractions Numerator: Multiply the denominator with an integer plus the numerator and the denominator remains unchanged.

The true score is 1 and 1 out of 15

It is a 16-minute walk from school to my sister and a 5-minute bike ride from my brother. At this rate, the brother and sister walked from home and school to each other at the same time, and when they met, the younger sister walked 250 meters. Q: How long is the journey from school to home?

250 5 * 16 = 800 (m) 800 + 250 = 1050 (m).

The television factory received a batch of production tasks, planning to produce 120 television sets per day, which could be completed on schedule, but actually produced 10 more units per day than planned, and the task was completed four days ahead of schedule. How many TVs are there?

Design: It is planned to produce 120 TVs per day, which will be completed in X days.

120x=(120+10)＊(x-4)

x = 52120 52 6240 (sets).

In order to fight floods and droughts, Xiahe Township organized an excavation team and a soil transportation team to build the river channel with all their might, and the number of the excavation team was 5/8 of the number of the two teamsLater, due to the need for work, after transferring 90 people from the excavation team to the earth-moving team, the ratio of the number of people in the excavation team to the earth-moving team was 2:3

How many people are in both teams?

90 [(5 8)-(2 5)]=90 [(25 40)-(16 40)]90 [9 40]=90x[40 9]=400 (person).

There was a shipment at the station, 40 of the total was transported in the morning, three-eighths of the total in the afternoon, and 36 tons were left undelivered. How many tons of cargo is there?

36 9 40 = 160 (tons).

2.A to B = 6 to 1

3.Ten out of nine.

Than 4 judgments: 1False 2Pair 3Wrong.

Applications:1Set x black sheep and 5 white sheep 7x sheep. Adding up to 120 gives x=70 70 black sheep and 50 white sheep.

3.The total score is 63 100 = 6300 (points).

Assuming that all girls are girls, there is a total of 70 100 = 7000 (points), which is 7000-6300 = 700 (points) more than the actual one

On average, each boy is 70-60 = 10 points less than each girl, and a total of 700 points more, there are 700 10 = 70 boys and 100-70 = 30 girls.

, 501, Black Sheep: 120 (1+5 7)=70, Aries: 120-70=502, Volleyball:

45 2 9=10, total: 10+45=553, boys: (70 100-63 100) (70-60)=70, girls:

30, 40 more boys than girls.

Done as required, do you get extra points?

,553, the number of male students is equivalent to nine-tenths of the number of female students.

Judgment. 1. False, because the reciprocal of 1 is equal to itself.

2. False, except for negative numbers, for example, A is equal to -1, B is equal to then A is greater than B.

3. Yes. Apply.

Let the number of black sheep = x and the number of white sheep = y

x+y=120

x÷y=5/7

x=120-y, bring in the two formulas.

120-y)÷y=5/7

120-y=5/7y

120 = one and five sevenths y

y=70x=50

2. Number of volleyballs = 45 2 9 = 10

Total number of balls for both types = 10 + 45 = 55

3. Set x boys and girls = 100-x people, because the total average score is 63, so the sum of the total score x x times 60 + the total score of girls (100-x) times 70 divided by 100 = 63 to get x = 70 people, 70 boys, 30 girls, 40 more boys than girls.

Fill a vacancy. 3.Ten out of nine.

Judge right from wrong. 1.False (the reciprocal of 1 is equal to itself).

2.Right. 3.Right.

Practical questions ( is the score line, * is the multiplier sign).

1.Solution: If there are x black sheep, then there are (120-x) white sheep.

120-x=5/7x

x=70120-70=50 (only).

A: There are 70 black sheep and 50 white sheep.

2.Solution: 45 + 45 * (2 9) = 55 (pieces) Answer: I bought a total of 55 of the two kinds of balls.

3.Solution: If there are x boys, then there are (100-x) girls.

60x+70（100-x）=63*100

x=7070-(100-70)=30 (person) Answer: There are 30 more boys than girls.

Hehe, I'm in my second year of junior high school, and now I feel so easy to do elementary school problems, and I participated in math competitions in elementary school and won the first prize every time

。For example: 1 solution: if there are 5x white sheep, then there are 7x black sheep.

5x+7x=120

x=10 Aries: 50 Black Aries: 70

Solution: 45 2 9=10 45+10=55

Solution: There are x boys and 100-x girls.

60x+70(100-x)=63 100x=70Don't be careless and work hard, it's better to solve the problem yourself.

Fill in the blanks: 6 3, 9 out of 10: 4

Judgment is true or false 1, false 2, true 3, true.

Application question 1: The number of white sheep is five-sevenths of that of black sheep, that is, white sheep accounts for 5 parts, black sheep accounts for 7 parts, and the total score is 12 parts.

So, the number of white sheep: 120x5 12=50 (sheep) The number of black sheep: 120x7 12=70 (only).

x(1+2 9)=55 (pcs).

3. The total score of the class: 63x100=6300 (points), assuming that all the total scores of the male class: 60x100=6000 (points), 6300-6000=300 (points) less than the actual number, the number of girls:

300 (70-60) = 30 people, more boys than girls: (100-30)-30 = 40 people.

Ten out of nine. 75 to 12

Wrong, right, right.

Let black sheep x, white sheep 5 7x, add equal to 120, 12 7x=120 solution x=70, black sheep 70, white sheep 50.

Volleyball 2 9*45=10, 10+45=55.

Let the system of equations x+y=100 and 60x+70y=100*63 be solved to x=70 and y=30

70-30 = 40 people.

Fill in the blanks, 55;2. B: A=1:6;3. 9 out of 10: 4.

Judgment: 1, False, 2, True, 3, False.

Application: 1. Black sheep x only, white sheep y only.

x+y=120

7y=5xx=70, y=50.

2. Volleyball = 2 9·45 = 10.

A total of 45 + 10 = 55 were bought.

3. X boys, B boys, y girls, C girls, and a total class score A (X+Y)=63

b/x=60,c/y=70

x+y=100

x=70, y=30, x-y=40 people.

So there are 40 more boys than girls.

(10 Waxin.)

It is in addition to the wheel state wheel.

It's not a detracement.

I remember that there seemed to be a difference.

1.The former term of a ratio is enlarged to 3 times the original, the latter term is reduced to 2 times the original amount, and the ratio (becomes the original 3 2

2.In 25% sugary water, the ratio of sugar to water is (1:3).

3.There is ABC

Three numbers, the ratio of a to b is 2 3:1 2

The ratio of b to c is 4 7:1, and the sum of b and c is known to be 66

Can you find out what a is?

a is 32

1.The ratio was reduced to two-thirds.

34.After 20 minutes, the three met again at the starting place, Li Fan ran 20 laps, Wang Chao ran 13 and 220/23, and Zhang You ran 16 laps.

1> 6 times larger.

2>1 to 3

b is 66 (4 7+1)*4 7=24

A is 24 divided by 1 2*2 3=32

4. > velocity ratio of 60:90:75, find their least common multiple to get 900That's 900 60 = 15 minutes, 15, 10, 12 laps each.

A has 40 teeth, B has 40*7 5=56 teeth;

Then C has 56*4 7=32 teeth;

Let the number of teeth of B be x and the number of teeth of C be y

40:x=5:7

5x=280

x=5656:y=7:4

7y=224

y=32

Start by choosing the base unit – with one tooth as the base unit.

A rotates seven times, that is, the rolling distance is 40 * 7 = 280 teeth, which is equal to B rotates 5 times, so B has 280 5 = 56 teeth in one circle, B rotates four times, and the rolling distance is 4 * 56 = 224 teeth, which is equal to C rotates seven times, so C has 224 7 = 32 teeth in one circle.

If it is written in a formula, it is [(40*7) 5]*4 7

This is very simple, A turns 7 times, A has 40 teeth, then it should be 40 * 7 = 280 teeth after 7 turns, B only needs 5 turns, so, B has 280 5 = 56 teeth, the same way:

The tooth of C is equal to 56*4 7=32

A has 40 teeth that rotate 7 times, which is equivalent to walking 280 teeth, and B also has 280 teeth, and at this time B rotates 5 times, then B should have 280 5 = 56 teeth;

In the same way, B has 56 teeth and advertises 4 turns, which is equivalent to walking 224 teeth, and C also has 224 teeth, and C rotates 7 times, then C should have 224 7 = 32 teeth.

Let B have x teeth and C have y. Then 7*40=5*x x=56

4*56=7*y y=34