Elementary School Math Problems Come on with all the math problems!

1) Solution: Set chickens (x-13) and rabbits x.

4x+(x-13)×2=262

4x+2x-26=262

6x=262+26

6x=288

x=48 x-13=48-13=35

A: 35 chickens and 48 rabbits.

50 (I checked it on the computer, yes, not 101).

1.Solution: There are x rabbits. There are chickens (x-13).

Equations can be listed according to the title:

4x+(x-13)×2=262

Solution x=48

That is, if there are 48 rabbits, then there are 48-13 = 35 chickens.

2.(2/3+7/10)-x=5/6

x=8/15

Isn't the fourth question a simple matter of eliminating the cracks? 4. 1/1*2 + 1/2*3 + 1/3*4 + 1/4*5

The first question will be done, but the first question is so difficult that it can't be counted for a long time.

4x+(x-13)*2=262 x=48

Question 2 doesn't need to be too complicated, I'm not good at math, can I come?

1. Solution: Set chickens (x-13) and rabbits x.

4x＋(x－13)×2＝262

4x＋2x－26＝262

6x＝262＋26

6x＝288

x＝48 x－13＝48－13＝35

A: 35 chickens and 48 rabbits. II

Three, four

1. Set x chickens and rabbits (x+13) then 2x+4*(x+13)=262 x=35 x+13=48 or 4*13=52 (if there are the same number of chickens and rabbits, then subtract 52 feet) 262-52=210 (a chicken and a rabbit have a total of 6 legs) 210 (2+4)=35 chickens 35+13=48 rabbits.

The first and second questions are done with equations.

The third question is Gauss's theorem.

The fourth question is dead reckoning.

Isn't the fourth question a simple matter of eliminating the cracks?

2 and 1 3 o'clock, ha, 3090 ml, 4050 kg, 3:24, 6 ha, 80,400 m² = ha, 3 tons 600 kg, 7:45, 72 hours, 380 min, 63 square decimeters = square meters, 50 cm, 4,375 kg, 9,300 ml = liters.

Please refer to the corresponding serial number for the number in parentheses.

There are so many troublesome questions, and your points are too small, so let's help you!

1.There are a total of x dollars 100 (x 100) 10 200 [x 100 (x 100) 10 200] 10

x 8100 yuan 100 (x 100) 10 100 (8100 100) 10 900

8100 900 9 pcs.

The rich man had 9 sons.

Upstairs, the equation is wrong, and the number is right. . .

2.4m 5 5n 4 5n 4m 1 solves the indefinite equation when n 5 m 6 holds, but n 5 does not fit the question.

When n 9 m 11 is established in accordance with the topic.

The smallest m=11 n=9.

3.2) Is MN equal to DC? Why?

Because mb 1 2ab bn 1 2bc so mn (mb bn) (ab bc) 1 2 ac 1 2

And dc ac 1 2 so mn dc ac 1 2

1) What is the length of MN?

mn＝10×1/2＝5

4.If there are 100 students taking the test, 81 will get the first question right, 85 will be the second question, and 91 will be the third question.

There were 74 people in the fourth question and 79 people in the fifth question. The total number of correct questions is 81 85 91 74 79 410

If you want to have the highest pass rate, then try to get the three questions right as much as possible: 410 3 136 ......2 More than 100 up.

So you should ask what is the minimum pass rate at the end of this question.

If you want to have the least pass rate, then try to get as many questions as possible wrong. （500－410）÷3＝30

5.The standard time goes 24 hours, and the alarm clock goes 24 60 24 1 2 1428 minutes.

The alarm clock went for hours, and the watch went for minutes.

24 60 minutes and 6 seconds.

The watch is 6 seconds slower than the standard time of day and night.

Are you sure it's elementary school level...

Question 1: 9 sons, $8,100.

n sons x dollars, x n=100+(x-100) 10%=200+[x-(x-100) 10%-200)] 10%.

Take the following equal sign to solve x=8100, and then take the first equal sign to solve n=9

Question 2: Wrong, any base system cannot have a single number that is the same as your own;

Question 3: It should be about the median line. The learning method in elementary school is to connect: MN, ND, DM, divided into 4, and then find that 4 are exactly the same, mn=10 2=5cm, and the same length as DC.

Question 4: 100%. Add 5 numbers to 3, greater than 100%, but only 100% can be taken, if the number of people to be rounded, can only be rounded and not placed.

The minimum is 70%. （500%-81%-…79%) 3=30%, up to 30% unqualified, this number can only be rounded up and not put into place. Therefore, at least 70% are qualified.

Question 5: Hard Idea Analysis: The standard time 24-hour alarm clock is 12 minutes slower, and the actual walk is 1440-12=1428 minutes;

In these 1428 minutes, the watch is 1 second faster every 2 minutes, so the watch is 1428 2 = 714 seconds = 11 minutes and 54 seconds.

The watch has gone for 1428 minutes + 11 minutes and 54 seconds = 1439 minutes and 54 seconds, which is 6 seconds slower than the standard time of 1440 minutes.

Transformation idea: The speed of the watch is the speed of the alarm clock (60 60 + 30) (60 60) = 121 120

The speed of the alarm clock is (60 60-30) (60 60) = 119 120 of the standard time speed

The watch speed is 121 120 119 120 = 14399 14400 slower than the standard time speed

24 hours in a day and night = 24 60 minutes = 1440 minutes, the watch is slow minutes, that is, 6 seconds.

1. y=cos wx-sin wx=cos2wx minimum positive period: 2 (2w)=4

w=1 42, f(5)=1 f(3)=f(1)=-5f(-5)=1 f(-3)=f(-1)=1 f(1)=-1 53, c to find the rule. Acquisitions** in the fourth month are the average of the previous three months.

Well, the seventh month is the average of April, May and June.

Question 1 1|4 Question 2-1|5 Question 3c

Let the original racetam type tomato X be eggplant 385-x

1 3x Manuscript 2 5 (385-x).

155x 385*6-6

11x＝385*6

x 35*6 key touch 210

Original tomatoes 210 eggplant 175

1. The water consumption in October is 250 (

November water use is 200 (

Water bill 250 in September

The water bill for October is 200

The water bill for November is 160

2. The percentage change in water consumption each month is the percentage change in water charges each month, and the water bill also increases by 10%.

1.September: Yuan) October: Yuan) November: Yuan).

2.Rule: When the ** per ton of water is certain, the water fee increases with the increase of water consumption, and decreases with the decrease of water consumption.

The water consumption in November is: 250 (1-20%) 2 = 160 (tons) then the water consumption in December is: 160 (1 + 10%) = 176 (tons) then the water fee in December is: yuan).

So the growth rate of water tariff is: (264-240) 240 = Actually, not only in this question, when the ** per ton of water is certain, the increase in water tariff and water consumption is synchronized.

Hope you learn and improve!

250 times 20% equals 50 tons 250-50 = 200 In this way, it took 200 tons in October, 160 tons in November, 375 yuan for water in September, 300 yuan in October, and 240 yuan in November. The rule is that for every 20% of the savings you make, you save less and less, and the same goes for your water bill. Water bills increased by 10% in December

1··· September: 250* October: 250* November: 250*

2··· If water consumption increases by 10% in December, the water bill will increase by 10%, i.e. the water consumption will increase by 1%, and the water bill will also increase by 1%.

375 yuan in September, 300 yuan in October, 240 yuan in November, the water bill remains the same, the more water you use, the more money you pay.

1, yuan).

250x(1-20%)=250x80%=200 (ton) yuan).

200x(1-20%)=200x80%=160 (ton) yuan).

375 yuan in September, 300 yuan in October, 240 yuan in November Monthly water fee x (1-20%) = October water fee.

October water bill x (1-20%) = November water bill.

If the water consumption in December increases by 10% compared to November, the water bill increases by 10%.

The work efficiency ratio is 4:3

The speed ratio is 3:4

The area ratio is 3:2

Incorrect are b and d

4:33:4

Large rectangular area: small rectangular area = 6:4c