Does the abacus mental arithmetic in grade one of primary school only include addition and subtraction

RELATED INFORMATIONS

• 1. As shown in the figure: it is known that the midpoint a (a, b) point B (a, 0) in the plane rectangular coordinate system satisfies | 2a-b | + (B-4) 2 = 0 (1) (2) given point C (0, b), point P starts from point B and moves at a speed of 1 unit per second in the negative direction of x-axis. At the same time, point Q starts from point C and moves at a speed of 2 units per second in the negative direction of y-axis. At a certain time, as shown in the figure, and s yin = 12s quadrilateral ocab, the moving time of point P is calculated? (3) Under the condition of (2), AQ intersects the x-axis at m, makes the angle bisector of ∠ ACO and ∠ AMB intersects at point n, and judges whether ∠ n - ∠ APB - ∠ PAQ ∠ AQC is a fixed value. If it is a fixed value, calculate the value; if not, explain the reason
• 2. Do you want to write the multiplication formula of the whole ten times one digit? () × () = () × () = () x () = 120
• 3. It is known that in the hyperbola X & # 178 / 9-y & # 178 / 16 = 1, a and B are the left and right vertices of the hyperbola, and the line L passing through point a is perpendicular to the X axis, Next: find the trajectory equation of the right vertex of the hyperbola and the point with the same distance from the straight line L For the benefit of both sides, the copy has been proofread,
• 4. Why is 1 divided by 10 equal to 0
• 5. Given the solution of the quadratic equation AX ^ 2 + BX + C = 0 about x? You have already answered the answer to this question, but can you tell us the detailed process, thank you. We know that the two univariate quadratic equations ax ^ 2 + BX + C = 0 about X are α and β, and the two equations x ^ 2 + (α + 1) x + β ^ 2 = 0 and x ^ 2 + (β + 1) x + α ^ 2 = 0 about X have a unique common root, so we can find the relationship of a, B and C The answer might be - B / a = - 2 / 5, C / a = - 3 / 25
• 6. The difference of negative power with or without brackets
• 7. When we ask the value of M, the equation x & # 178; - 2mx + 2m + 3 = 0 has two negative numbers
• 8. What is the formula of standard deviation, covariance and correlation coefficient
• 9. How to calculate the area of parabola and straight line with definite integral The parabola y = the square of X and the straight line y = 2x form the figure and area from 0 to 2
• 10. Primary school fifth grade mathematics exercise book (1) 45 answers
• 11. Finding a monotone increasing interval of F (x) = SiNx ^ 2
• 12. Limit calculation of advanced mathematics lim tanx-sinx / x^3 x→0
• 13. Is the English phrase scissors singular or plural
• 14. The answers to the judgment questions in this English passage (rain)
• 15. About, a, of, shoes, mother, for, Ken, pair, his
• 16. The trousers a pair of shoes
• 17. This purple bag looks very beautiful
• 18. Matches new trousers pair this shoes of your
• 19. English translation I don't know how to use it, such as "1. At this critical moment, he retreated. 2. This decision is related to Tom's life and death, so he thought about it for a long time
• 20. Several English sentences, phrases translation I decided not to talk to each other Compare yourself with others Make mistakes in a certain way With the help of the teacher Doing a lot of listening practice helps a lot Hard work is the secret of success How do you usually deal with your problems How about practicing pronunciation by reading aloud? The boy is afraid to speak in class Do you have any difficulty in memorizing new words this term Is this session of junior three English master answer I am a junior high school, do not appear I do not know the word. These teachers said are learned. We should make our own