![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
In the multiplication formula, those formulas can only calculate one multiplication formula and one division formula
One by one, one by one
Two two get four
Three is nine
Forty six
Five five twenty five
6636
7749
8864
9981
Nine sentences in all
In the plane coordinate system, point a (- 3,0), B (0,6), C (0,1), D (2,0), find the intersection coordinates of line AB and line CD
Let the analytic formula of the straight line AB be y = K1X + B1a (- 3,0), B (0,6) be substituted into - 3k1 + B1 = 0b1 = 6K1 = 2, the analytic formula of the straight line AB be y = 2x + 6, the analytic formula of the straight line CD be y = k2x + B2C (0,1), D (2,0) be substituted into B2 = 12k2 + B2 = 0k2 = - 1 / 2, the analytic formula of the straight line CD be y = (- 1 / 2) x + 1, and the equations be solved by y =
If 3sin2a + B2 + cos2a − B2 = 2, (COSA · CoSb ≠ 0), then tanatanb=______ ．
3sin2a + B2 + cos2a − B2 = 3 × 1 − cos (a + b) 2 + 1 + cos (a − b) 2 = 4 − 3cos (a + b) + cos (a − b) 2 = 2, 4-3cos (a + b) + cos (a-b) = 4, i.e., 3cos (a + b) = cos (a-b), 3cosacosb-3sinasinb = cosacosb + sinasinb, i.e., 2cosacosb = 4sinasinb, then ta
The following statement is correct ()
A. Positive and negative numbers are opposite to each other B. two numbers with different symbols are opposite to each other c. the numbers represented by two points on both sides of the origin on the number axis are opposite to each other D. any rational number has its opposite number
A. B, C, Ru + 3 and - 2 are not mutually opposite numbers, so this option is wrong; D, any rational number has its opposite number, which is correct
High school logarithmic function equation and inequality
1. Solve the following equation
① 2^（1-x）=5
②2×5^x+1-9=0
2. Solve the following inequality:
①5^(x+2)＞2
②3^(3-x)＜6
1. Solve the following equation
① 2^（1-x）=5
X = 1-lg2 (5) (denotes logarithm of base 5 with 2)
②2×5^x+1-9=0
5^x=4
x=lg5(4)
2. Solve the following inequality:
①5^(x+2)＞2
5 ^ x is a monotonically increasing function
x+2>lg5(2)
x>lg5(2)-2
②3^(3-x)＜6
3 ^ x is monotonically increasing
3-x2-lg3(2)
1. A certain factory produced 16 pieces of A-type products in January, and the growth rate of each month in the first quarter was the same. The production of A-type product increased by 10 pieces every month compared with that of the previous month. We also know that the ratio of A-type and B-type products in February is 2:3, and the total output of the two products in March is 65 pieces, so we can calculate the output of B-type products in January
2. Party A and Party B start from a and B respectively and walk towards each other. If they start at the same time, Party A will walk 12 kilometers more than Party B when they meet. After meeting, Party A will walk another 4 hours to arrive at place B, and Party B will walk another 9 hours to arrive at place A. find out the distance between a and B and the speed of Party A and Party B
3. To make a rectangular carton board with a cover, its bottom area must be fixed. If the width and height of the bottom are equal, then use 78 square centimeters of cardboard; if the length and height of the bottom are equal, then use 110 square centimeters of cardboard. If the seams are not included, calculate the length and width of the bottom
We should use unknowns to solve the problem
Let the total distance be 2S, and the speeds of a and B are a and B respectively
According to the following conditions, we can list: (S-12) / a = 4, (s + 12) / b = 9. From (S-12) / a = 4, (s + 12) / b = 9, we can express that a and B are substituted into the front, s = 60 is solved, s = 60 is substituted into (S-12) / a = 4, (s + 12) / b = 9, a = 12 and B = 8 are solved
The third question: let length and width be a, b.2ab + 2 (a + b) a = 110 and 2Ab + 2 (a + b) B = 78 respectively
Use appropriate symbols to indicate the relationship between sets a and B in the following questions
A={x|x=2n,n∈N},B={x|x=4n,n∈Z}
A={x|x=2n+1,n∈Z},B={x|x=4n±1,n∈Z}
If you have a calculation, write it down
B∈A
B∈A
How can I not spell Pinyin like Bian Dian Tian? Can I spell it like ban Dan? Do Ian have special pronunciation together?
Ian is not read out by practicing, for example, the first initial consonant, Bo Yi An is not connected, I alone is homophonic of man one, so try it
What is the chord length formula of a circle?
Chord length = │ x1-x2 │ √ (k ^ 2 + 1) = │ y1-y2 │ √ [(1 / K ^ 2) + 1]
Where k is the slope of the straight line, (x1, Y1), (X2, Y2) are the two intersection points of the straight line and the curve, "│" is the absolute value sign and "√" is the root sign
The formula of sixth grade ratio and proportion in primary school
The division of two numbers is also called the ratio of two numbers. The process of transforming the preceding and the following terms of the ratio into the simplest integer ratio by using the basic properties of the ratio is called the reduction ratio. The quotient obtained by dividing the preceding and the following terms of the ratio is called the ratio
What is the ratio?
Division of two numbers is also called the ratio of two numbers
2. What is proportion?
The expression that two ratios are equal is called proportion
3. How to judge whether the two ratios can form a proportion?
See if the ratios are equal
What is the basic property of ratio?
The former and the latter of the ratio multiply (divide) the same number (except 0), and the ratio remains unchanged
6. What is the basic nature of proportion?
In proportion, the product of two external terms equals the product of two internal terms
9. How to judge whether two quantities are in proportion?
Correlation, the ratio is certain
10. How to judge whether two quantities are in inverse proportion?
Correlation, product is certain
How to enlarge and shrink a figure in proportion?
Expand and reduce the length of each side of the figure as usual
How to use proportion to solve problems?
1. Determine which quantity is constant;
2. Consider whether the other two quantities are in direct proportion or in inverse proportion;
3. List the proportion or equation;
4. Solve a scale or equation
RELATED INFORMATIONS
- 1. Solving logarithmic equation lg[(1-x)/(1+x)]+1/(x+2)=0
- 2. As shown in the figure, it is a big rectangle made up of five identical small rectangles. The perimeter of the big rectangle is 44 cm. Calculate the area of the big rectangle
- 3. It is known that a, B, C and D are four different integers, and ABCD = 25
- 4. Solution equation: (2x + 3) + (X-7) (x + 6) = x & sup2; - 10 Solution equation: X (2x + 3) + (X-7) (x + 6) = x & sup2; - 10
- 5. The general solution of the equation with absolute value in high school mathematics The solution of linear equation and quadratic equation with letter coefficient, the distribution of roots of quadratic equation with letter coefficient The solution of one variable linear equation and one variable quadratic equation with absolute value The solution of linear inequality of one variable with letter coefficient and quadratic inequality of one variable The linear inequality of one variable with absolute value
- 6. If f (x) is an odd function defined on R and f (x + 1) = f (x-1), then f (1 / 2) + F (3 / 2) + F (5 / 2) + F (7 / 2) =?
- 7. On the number axis, the distance between a point and 1 is 2, so what is the absolute value of the number corresponding to this point? And explain the reason
- 8. If the three sides of a right triangle are 2, 3 and X, then the area of a square with the hypotenuse as the side length is______ ．
- 9. In the triangle ABC, D and F are the triangles of AB and E and G are the triangles of AC. then the ratio of the area of ade to that of dfge and fbcg is?
- 10. A graph, the area of triangle ABC is 1, BD: DC = 2:1, e is the midpoint of AC, ad and be intersect at P, then the area of quadrilateral pdce is___ Better have a picture
- 11. 1. Chengbei primary school has three extracurricular groups: the science and Technology Group has 10 people, accounting for 20% of the total number of the three groups. The ratio of the number of literature and art groups and sports groups is 3:1. How many people are there in the sports group? How many people are there in the literature and art group? 2. In ancient times, the height of a big tree was usually measured by the shadow of a big tree. There was a man whose height was 1.8 meters, and his shadow length was 2.88 meters. At the same time and at the same place, the shadow length of a tree was 12 meters. How many meters was the height of the tree?
- 12. Write out the symbols, main units and functions of resistance, capacitance, crystal oscillator, inductance and diode in the circuit diagram
- 13. It is known that Bo and Co are bisectors of ∠ ABC and ∠ ACB of △ ABC respectively, and Bo and co intersect at O. this paper attempts to explore whether there is a fixed quantitative relationship between ∠ BOC and ∠ a
- 14. Idioms, sayings, proverbs, poems and a story or legend about the bridge Three idioms, three proverbs, three poems, one story or legend (short and simple), choose the best!
- 15. There are 5 poems, 5 idioms, 5 proverbs about weather
- 16. Idioms about four I would like to take our group name, we are 4 groups, 6 people, do you have any suitable idioms or words to summarize? Great Xia, please help me, don't leave a message Can homophonic, show very powerful, the following words I do not understand a
- 17. Who has a saying or poem about horses? As long as there is a horse!
- 18. Horse idioms, sayings and poems
- 19. Poems and idioms about horses
- 20. There are 2400 popular science books and literature and art books in the library of a residential area, of which literature and art books are 1.5 times of popular science books. How many popular science books are there? It's just a formula, not a calculation