If the real numbers a, B and C form an arithmetic sequence, find the trajectory equation of the midpoint of the line segment by finding the family of lines ax + by + C = 0 cut by the circle x ^ 2 + y ^ 2 = 5

RELATED INFORMATIONS

• 1. When Xiao Ming is doing multiplication, he takes one of the factors 21 as 12, and the result is 1107 less than the correct product. What is the correct product?
• 2. Translation of English mathematical problems fourteen decreased by a number is equal to twice the same number plus eleven?
• 3. At present, there are 86 living allowance places, which should be divided into four classes. There are 71 people in the first class, 71 people in the second class, 67 people in the third class and 33 people in the fourth class Q. how can the quota be allocated to the first class fairly? Please write the calculation process
• 4. Using formula method to solve the equation MX '- (3m + 2) x + 2m + 2 = 0 (M is not 0)
• 5. There are 48 people in a class. Everyone can play chess. The number of people who can play chess is twice as many as the number who can play go. There are three less people. The number of people who can play both kinds of chess is at most 9, but not less than 5. The number of people who can play go is () A. 20 B. 19 C. 11 or 13 D. 19 or 20
• 6. There are 48 people in a class. Everyone can play chess. The number of people who can play chess is twice as many as the number who can play go. There are three less people. The number of people who can play both kinds of chess is at most 9, but not less than 5. The number of people who can play go is () A. 20 B. 19 C. 11 or 13 D. 19 or 20
• 7. There are 48 people in a class. Everyone can play chess. The number of people who can play chess is twice as many as the number who can play go. There are three less people. The number of people who can play both kinds of chess is at most 9, but not less than 5. The number of people who can play go is () A. 20 B. 19 C. 11 or 13 D. 19 or 20
• 8. There are 48 students in a class. The number of people who can play chess is three times that of people who can play go. The number of people who can play both kinds of chess and can't play both kinds of chess is four
• 9. Use five 3's and some mathematical symbols to form an equation equal to 0, in which there must be at least one fraction
• 10. Li Hua and Wang Jun went to buy greeting cards. Wang Jun bought 2.5 times as many as Li Hua. After Li Hua bought another 15, they now have the same number of cards. How many cards did they each buy? (solved by equation)
• 11. Someone puts table tennis balls into two kinds of boxes. Each big box contains 12 balls and each small box contains 5 balls. If there are 99 balls and the number of boxes is more than 10, how many balls are in each big box and small box? (explain the reason)
• 12. Seek 100 primary school fourth grade arithmetic problem set
• 13. I'm in trouble. Help Fill in the blanks and count () * 1 () = () () 52. You can choose any number 346789 to fill in the brackets, but you can't use the same number repeatedly, which means that each number can only be used once, and the final result should be correct. Please help me
• 14. Please look at this question for me A and B are 1550 meters apart. Now a starts from a and B at the same time. A's speed is 75 m / min, B's speed is 65 m / min, and C starts from B at the same time, the speed is 85 m / min? Please ask the next floor, why is the distance between Party A and Party B 70t? This problem, like everyone else, I calculated 8.61, but the answer given by the child's teacher was 10, so I couldn't think of the solution.
• 15. Brother and sister, uncle and aunt, do me a favor There are 21kg biscuits left in box a and 19kg biscuits left in box A. if there are 1lg biscuits left in box a and Box B, how many kg biscuits are there
• 16. In the figure below, there are sixteen squares with four circles, four five stars and four triangles. Can you divide the sixteen squares into four blocks according to their size and shape, and each block must have one circle, one no star and one triangle? ○ ★ ▲ ▲ ▲ ○ ○ ○ ★ ★ ★ ▲ Sorry, because Baidu can't display graphics, so they are all crowded together I use words to express, circle (circle), triangle (angle), five stars (star), space (space), you can draw on the drawing. (circle) (space) (star) (angle) (angle) (angle) (circle) (empty) (empty) (circle) (circle) (star) (star) (star) (space) (angle)
• 17. A simple calculation of "450 / 25" in the fourth grade
• 18. An arithmetic problem (simple calculation in Grade 6) 1/3 - 2/15 + 3/35 - 4/63 + 5/99 -6/143
• 19. Simple calculation and arithmetic problems 1. 99999 times 26 + 33333 times 22 =? (simple calculation) 2. 609-708 + 306-108 + 202-198 + 497-100 =? (simple calculation) 3、9 8 7 6 5 4 3 2 1=1993 4、1 2 3 4 5 6 7 8 9=1993
• 20. To solve arithmetic problems quickly. (to process) (urgent!) ① 4.31 * 1 / 2 + 5.69/2 ② 1 * 7.58 + 3.42 * 25% - 0.25 ③ 11 / 15 + (2 / 3-3 / 5) / 1 / 4 ④ 2 of 6.75 * 5 + 3.6 * 6 and 3 of 4 + 27 of 4 * 9 ⑤ 75 * 2.5 * 4 of 2 ⑥1.25*3.2*25