The rule that the second power of 3-1 = 8 x 1, the second power of 5-3 = 16 = 8 x 2
(n+2)-n=4(n+1)
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- 1. 123456789 in the nine palace grid, horizontal, vertical and oblique, every three numbers add up to a sum
- 2. The nine numbers 1-9 are listed in three formulas. The sum of horizontal, vertical and oblique directions should be equal to 15. How to calculate? Is there any rule?
- 3. How to prove that the median line of a triangle is parallel and equal to half of the third side, and can't be proved by similar triangles@@@@ Such as the title
- 4. I want to prove the inverse theorem of Menelaus theorem
- 5. Is the proposition "all equal angles are opposite vertex angles" true? If not, please give counter examples
- 6. The proposition "the middle line on the hypotenuse of a right triangle is equal to half of the hypotenuse". Is this proposition true? If it is a true proposition, please write the process of knowing, proving and proving; if it is a false proposition, please explain the reason; Write the inverse proposition of its proposition
- 7. 1、 Calculation: (1) - 3.75 + (- quarter) equals (); (2) (- 4) + (- 10) + 4 equals (). 2. (1) if a = - 2, then a+|- 2、 (1) if a = - 2, then a + | - a | equals (); (2) If | a | = 2, | B | = 3, then a + B equals () 3、 If one number is 9 and the other number is 2 larger than the opposite number of 9, then the sum of the two numbers is () 4、 Calculate the following questions: (1) 6 + (- 5.6); (2) 0 + (- 6 and 1 / 4) 5、 When a = - 3.6, B = - 2 and 3 / 5, find the values of the following formulas (1)-a+(-b);(2)(-a)+b Offer a reward before 9:20!
- 8. Six one eighths equals nine one twelfth equals three one fourths, right? Please correct? How do you understand this? Please explain the basic principle and its formula?
- 9. One 6 out of 8 is equal to three 3 out of 4. Why? Please explain the basic principle and its formula? Can you give more examples? If not, can you tell me?
- 10. What process is two thirds x-half (x-three-thirds) = 1
- 11. As shown in figure (1), it is known that AB is parallel to CD. What's the relationship between ∠ bed and ∠ B, ∠ D? Explain the reason and express it in words (geometric language)
- 12. If s = 1 + 1 / 2 + 1 / 3 + 1 / 4 + 1 / 5 + 1 / 6 + 1 / 7 + 1 / 8 + 1 / 9 + 1 / 10, which two consecutive integers are between
- 13. Which integer is the result of 1 + 1 / 2 + 1 / 3 + 1 / 4 + 1 / 5 + 1 / 6 + 1 / 7 + 1 / 8 + 1 / 9 + 1 / 10 greater than and less than? The child asked a homework in grade one, 1 + 1 / 2 + 1 / 3 + 1 / 4 + 1 / 5 + 1 / 6 + 1 / 7 + 1 / 8 + 1 / 9 + 1 / 10, which integer is greater than and less than, these two integers are two adjacent integers Please tell me the main process
- 14. 1+2-3-4+5+6-7-8+9+10-11-12+…… Is it a continuous integer starting from 1? Take two positive integers and two negative integers in turn. What is the sum of them? Fast, complete
- 15. Is the square equation still true when both sides of the equation are equal?
- 16. Using the formula to calculate (2a + 1) ^ 2 - (1-2a) ^ 2
- 17. A (n) = 2A (n-1) + 1, find the general formula of a (n). Write the steps
- 18. A cylindrical bucket with a bottom radius of 20 cm is filled with water. Now a cone iron block with a bottom area of 314 square cm is submerged in the water. The water surface rises by 8 cm. How high is the cone iron block? If you want to use + - × / to express, * doesn't look good
- 19. The problem is as follows, the method adds the answer, wants the formula Divide two numbers, the quotient is 22, the remainder is 8, the divisor, the divisor, the quotient, the sum of the remainder is 866, how much is the divisor and the divisor? There's no point. Have pity on me
- 20. There were 56 students in the mathematics interest group of a school, among whom, girls accounted for 85%, and then transferred to some boys. At this time, the ratio of the number of girls to the number of boys was 7; 5. How many boys were transferred later