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On angles and the measurement of angles, With your question, "it is known that α and β are obtuse angles. The results of calculating 1 / 6 (α + β) of a, B, C and D are 26 degrees, 50 degrees, 72 degrees and 89 degrees, including the correct results. Then who do you think the correct results may be given? Write clearly
An obtuse angle is an angle greater than 90 ° and less than 180 °
90°+ 90°
The first volume of junior high school English evaluation manual 70~
1.need to do 2.keep fit 3.have...for breakfast 4.feel hungry 5.between meals
6.too much sugar 7.be bad for 8.plan to do sth.9.go swimming 10.a swimming pool
The number a is two-thirds of the number B, the number B is three-quarters of the number C, the sum of the three numbers a, B and C is 216, and what are the three numbers a, B and C? The elf said, let the number B be unit 1, and use the number B to represent the calculation of the number a and C respectively
A = 24 b = 72 C = 96
There are three cards marked with the letter A and six cards marked with mathematics 1, 2, 3, 4, 5 and 6 respectively. If any five cards form a brand, they can form different brands
Six numbers without letters, five others, 6 × 5 × 4 × 3 × 2 × 1 = 720
One letter, six numbers, four others, 15 * 5 * 4 * 3 * 2 * 1 = 1 800
Choose three of the six numbers of two letters, and the other letters are the same, repeat once, × 1 / 210 × 5 × 4 × 3 × 2 × 1 = 1200
Choose two of the six numbers of the three letters, and repeat them five times (that is, the whole arrangement of the three A's is six times, that is, repeated five times) × 1 / 6 5 × 5 × 4 × 3 × 2 × 1 = 300
720+1800+1200+300=4020
Party A and Party B have several yuan in total. It is known that the amount of money of Party B is three seventh of that of Party A. if Party A gives Party B 39 yuan, then the amount of money of Party B is four fifths of that of Party A?
If a has x yuan, B has 3 / 7X yuan
3/7X+39=4/5X
39=13/35X
X=105
B money = 3 / 7 * 105 = 45 yuan
The image of double hook function
As shown in the figure: the red line is y = x + 1 / x, the green line is y = x - 1 / x, and the straight line is y = x (for reference, it is an asymptote)
The average number of a and B is 32. Three fifths of a is equal to B. find a
The average of a and B is 32. Three fifths of a equals B. how much is a
Then the sum of a and B is 32 × 2 = 64
So the number of a is:
64÷（1+3/5）
=64÷8/5
=40
Why is the non-homogeneous linear system AX = B with no solution equivalent to R (a) + 1 = R (rank of augmented matrix)? Can't we add 2?
The column vector of the augmented matrix is only one more than the coefficient matrix A
It takes 6 points for a and 4 points for C to process a part. Now there are 3700 parts to be processed and completed in the same time. How many parts should each person do
Rui is unstoppable,
The ratio of work efficiency of three persons is as follows:
1/6：1/5：1/4＝10：12：15
What should a do
3700 × 10 / (10 + 12 + 15) = 1000
Second, what should we do
3700 × 12 / (10 + 12 + 15) = 1200
What should a do
3700 × 15 / (10 + 12 + 15) = 1500
1/5x+3/7=3/7x
1/5x+3/7＝3/7x
3/7x-1/5x=3/7
(3/7-1/5)x=3/7
8/35x=3/7
x=3/7÷8/35
X = 1 and 7 / 8
RELATED INFORMATIONS
- 1. English Evaluation Handbook for grade one 2、 Translate the following phrases Take time to do sth 3．a member of_________ 4. Chat with each other 5．my favourite lessons_____________ 6. At lunch 7．have a good time__________ 8. Twice a week
- 2. The first grade of junior high school, First grade English evaluation manual with the answer of Unit2, good words give him 100 points!
- 3. Ask a problem of linear equation of one variable! If the order of three or three digits is reversed, the sum of the three digits is 1771
- 4. Mathematical master to solve (equation of one variable and one degree) A middle school requires students to build their own playground. It takes 7.5 hours to do it alone on the first day of junior high school; it takes 5 hours to complete it alone on the second day of junior high school? I've given you all my little fortune. I've written the title! I've got extra points in one hour!
- 5. Mathematics, solution of linear equation with one variable Since January 1, 2006, a city has implemented the rural cooperative medical system in an all-round way. Every farmer can enjoy the cooperative medical system with only 10 yuan each year. The following table shows the reimbursement rate of hospitalization expenses after the implementation of the rural cooperative medical system Reimbursement rate of hospitalization expenses (yuan) (%) The part not exceeding 3000 yuan 3000-4000 25 4000-5000 30 5000-10000 35 10000-20000 40 Over 20000 45 How many yuan did a person actually bear when he was hospitalized and reimbursed 805 yuan?
- 6. Help with math, The purchase price of a commodity is 3000 yuan and the price is 4500 yuan 1. The store requires a discount of no less than 5% of the profit. How much discount is the minimum? 2. If the market situation is not good, the store requires that the sales without loss be sold at a discount. How much discount is the minimum? 3. If there is a large stock of this product, the store requires a discount of no more than 5% of the price at a loss. How much discount is the minimum?
- 7. Mathematical equation of first degree with one variable A. There are two routes between two places B. one person rides a bicycle along Route 1 to B at the speed of 9km / h, and then returns to place a from place B along Route 2 at the speed of 8km / h. It is known that route 2 is 2km less than Route 1, and it takes one eighth of an hour less. How long is Route 1? There are several black and white balls, and the same color balls have the same mass, so do the weights. For the first time, one black ball plus two white balls is equal to one weight, and for the second time, three black balls plus one white ball is equal to two weights. How many white balls can be balanced with one black ball?
- 8. A cylindrical paper tube is a square with its side expanded. It is known that the bottom area of the cylinder is 5 square decimeters. What is its surface area? 2. The distance between a and B is 10000 kilometers. A rides a bicycle and B walks. At the same time, from a to B, the speed of a is four times faster than that of B. on the way, a's bicycle breaks down and the repair of the car is delayed for some time. So when B arrives at B, a is 200 meters away from B. how many meters does a repair the car and B walk? There are two bags of rice. The original ratio of rice to grain in the two bags is 12:7. After taking 10 kg from the first bag and putting it into the second bag, the first bag is 1 and 1 / 9 times as much as the second bag. How many kg of rice are there in the first bag? The average score is 9.64 after removing the highest score and the lowest score. The average score is 9.72 after removing the lowest score. The average score is 9.61 after removing the highest score Ancient arithmetic: today there are five cattle and two sheep, which are worth ten liang of gold; two cattle and five sheep, which are worth eight liang of gold. How much gold are cattle and sheep worth? It is 108 meters long from one end of the playground to the other end. A red flag is inserted every 4 meters on one side of the playground and at both ends. Now, a red flag is inserted every 6 meters. How many sides (including the two sides of the end) can be left out? How many sides need to be pulled out?
- 9. If you want to use the linear equation of one variable, you can't learn the linear equation of two variables 14. Xiao Ming's father is riding a motorcycle with Xiao Ming on the road at a constant speed. The following is the mileage Xiao Ming sees every other hour. Can you be sure that Xiao Ming's 12:00 is the milestone he sees? 12: 00 is a two digit number, and the sum of its two digits is 7 13: The ten digit and the one digit numbers at 12:00 are reversed 14: There's a zero in the middle of the two digits you see at 12:00
- 10. The length of each circle of the circular runway is 800 meters. It is known that a and B are 200 meters apart on the circular runway. If they start at the same time and walk in the same direction, and a is in the front and B is in the back, it takes 4 minutes for them to meet for the first time. It is known that the speed of a and B is constant, and a runs faster than B. if they start at the same time and walk in the same direction, a is in the back and B is in the front, how many minutes does a exceed 100 meters of B? It is required to use binary linear equation solution!
- 11. Calculation of the first grade of junior high school 1.180 degrees - (48 degrees 39 minutes 40 seconds + 67 degrees 41 minutes 35 seconds) 109 degrees, 11 minutes, 4 seconds divided by 7 23 degrees 41 minutes 34 seconds times 3
- 12. How to teach the first advanced mathematics lesson in the new term?
- 13. How to have a good math class
- 14. What is a control experiment in the first year of junior high school
- 15. Put forward the question: according to the knowledge learned, eating fruits and vegetables often can prevent scurvy and enhance the body's immunity, because fresh fruits and vegetables are rich in vitamin C. but the nature of vitamin C is not stable enough, high temperature cooking, long-term storage and so on are easy to be damaged. As a common vegetable, can cucumber be eaten raw or cooked to make the human body absorb more vitamin C What about vitamin C? Make a hypothesis: your hypothesis:______ Make a plan: ① take two equal portions of cucumber, boil one portion of them, make juice respectively, and pour them into two small beakers. ② take two clean and dry small tubes No. 1 and No. 2, respectively, and inject 2ml of potassium permanganate solution of different concentrations, absorb the juice of raw cucumber with a dropper, and drop it into tube No. 1 drop by drop, while shaking and observing, until the color of potassium permanganate solution fades (3) then use the same dropper to absorb the juice of ripe cucumber, drop it into test tube No. 2, shake and observe the color of potassium permanganate solution until the color fades, and record the number of drops of juice (m)______ ．（2）______ Implementation plan: carry out the experiment according to the revised plan, count and analyze the experimental phenomena. Conclusion: Please predict the three experimental results and draw the corresponding conclusions (3)______ ．（4）______ ．（5）______ ．
- 16. Biology problems in grade one of junior high school Research on the experiment of "the influence of plants on air humidity" 1. Your question () 2. The hypothesis you made () 3. After comparing the air humidity of bare land, grassland and dense shrub, you know that the maximum air humidity is () and the minimum is () 4. Through inquiry, you come to the conclusion that () 5. Please refer to the relevant information and talk about the role of plants in improving our living environment? Solving++
- 17. Paramecium eat bacteria, so they are consumers and bacteria are decomposers. How to draw the food chain We can't start with bacteria, we can't start with Paramecium, because there are no decomposers in the food chain, and we have to start with producers
- 18. The food chain is formed by living things for the sake of other living things
- 19. The first volume of junior high school biology textbook content, urgent
- 20. A math problem in a textbook This is the fourth and eighth exercise of the sixth grade of pep Children's weight should not exceed 3 / 20 of their weight. If they carry heavy objects for a long time, it will cause low back pain and backache, and even hinder bone growth Wang Ming: weight 30kg, 5kg in the schoolbag (1) Is Wang Ming's schoolbag overweight? Why? (2) Weigh your weight and figure out how many kilograms you'd better not carry. (I can't do this.) my weight is 35kg