![](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>)
What's the difference by subtracting 2 times of 4 / 5 from the reciprocal of 9 / 2?
The reciprocal of 9 / 2 is 2 / 9
Twice as many as four fifths is eight fifths
SO 2 / 9 - 8 / 5 = - 45 / 62
Given that a, B, C and D are mutually unequal integers, and ABCD = 9, then the value of a + B + C + D is equal to ()
A. 0b. 4C. 8D
The four numbers are less than or equal to 9, and they are not equal to each other. From the product of 9, there must be 3 and - 3 in the four numbers. The four numbers are: 1, - 1, 3, - 3, and the sum is 0
On integral Division~
Given any nonzero number, the final output result is: m → square → - M → △ m → + 2
A,m B,m² C,m+1 D,m-1
The answer is C, but it is only calculated with positive integers. If it is calculated with negative numbers, it should be wrong in the second step M & # 178;. Then does this question include negative numbers or not?
No problem, because the square of any non-zero number is an integer, this calculation program can be regarded as a formula:
（m²-m）/m +2=m+1
RELATED INFORMATIONS
- 1. Multiplication problems of rational numbers in grade one mathematics 1. Connect 2, 3, 4 and - 6 into a formula by adding, subtracting and multiplying, and the result is 24, then the formula is () 2. Subtract 1 / 5 of - 2005, then subtract the remaining 1 / 6, then subtract the remaining 1 / 7. Then subtract the remaining 1 / 2005, and finally get () 3. If three integers a, B and C satisfy ABC = minus 24, then a + B + C has a maximum of (), a minimum of (), and an absolute minimum of () 4. Practical questions: there is a column of numbers. If the first number is negative, it can be multiplied by - 3 to get the next number; if the first number is positive, it can get the next number by subtracting 5. Now we know that the first number is 7. What is the number 2006 in this column?
- 2. For a book by mail, the price of each book is a yuan, plus 10% of the book as the postage. For n books, the total amount is y yuan, then y = (), when a = 1.2N, n = 36, y value is ()
- 3. Division calculation of rational numbers （-27）÷3 （-3.6）÷（）-2 （-9）÷3×（-3）
- 4. 4. How to fill in 4, 5, 7, (), (), ()
- 5. 10 9 8 7 6 5 4 3 2 1 = 1 fill in the mathematical symbol in the brackets
- 6. The correct answer number of multiple choice questions is in brackets 406.06464…… The number is (), abbreviated as () A. Pure cycle decimal B. mixed cycle decimal C. 406. 06464 cycle
- 7. (put the serial number in brackets) 1. The length, width and height of a cuboid are 5 decimeters, 4 decimeters and 6 decimeters respectively, and the sum of its edges is () A. 60 decimeters b.60 square decimeters c.120 cubic decimeters d.30 decimeters 2. A cuboid steel is 3 meters long and its cross-sectional area is 240 square decimeters. The volume of this steel is () A. 7.2 cubic meters b.7200 cubic meters c.7200 square meters d.72 cubic centimeters 3. Cut a cuboid which is 6 cm long, 5.2 cm wide and 4 cm high into the largest cuboid whose volume is () A. 64 cubic decimeter b.64 cubic centimeter c.216 cubic decimeter d.216 cubic centimeter 4. Place several cubic decimeter cubes into the smallest cube (excluding the case of only one cube). The volume of the cube is () A. 4 cubic decimeters B.6 cubic decimeters c.8 cubic decimeters d.16 cubic decimeters 5. A cuboid wooden box with a volume of (40 × 30 × 30) cubic centimeter can hold at most () cubes with an edge length of 1 decimeter A.30 B.36 C.40 D.36000
- 8. Choose (put the serial number of the correct answer in brackets) A bag of rice has 64 kg, if you eat 3 kg a day, enough to eat () days A.20 B.21 C.22
- 9. Fill in the number of the correct answer in brackets &The movement of elevator ③ Take photos &(4) projection slide ⑤ Paper cut Butterfly A. Translation B, rotation C, symmetry D, magnification
- 10. Choose words and fill in the blanks (only fill in the serial number of words) (A) The legend of (b) and the story of (c) 1. Fill in () in bracket a 2. Fill in () in bracket B 3. Fill in () in bracket C A. Jingwei reclamation B. grinding Xu Cheng Zhen C. Dayu water control D. digging canal E. Li Bing controls water F. dripping wears away stone g. Kua Fu pursues the day h. Yi shoots at the nine days The legends of () and () and the stories of () express the indomitable struggle spirit of Chinese people in ancient times
- 11. What's the difference between the reciprocal of 5 and 6
- 12. Division of elementary dichotomy X ^ 2-4y ^ 2 / x ^ 2 + 2XY + y ^ 2 divided by X + 2Y / 2x ^ 2 + 2XY
- 13. I've heard that subtraction, multiplication and division can be converted into addition in computer. For example, subtraction can be multiplied by - 1. I want to know how to convert division
- 14. What knowledge did you learn about division by oral arithmetic in unit 6 of Volume 1 of grade 4
- 15. Divisor is a one digit division estimation, the general divisor as the number of (), divisor (), with the basic method of oral division calculation!
- 16. I am confused, thank you very much for giving 3j to a friend
- 17. The surface area of the earth is more than () kilometers? The surface area of the earth is more than () billion square kilometers? The land of human life accounts for about () of the surface area?
- 18. The earth's surface area is about 510 million square meters, of which 70.8% is ocean area and 29.2% is land area What's the sea area? What's the land area?
- 19. Formula of surface area of sphere It's better to indicate the meaning of each letter!
- 20. It is known that the volume of a sphere with radius R is v = 4 / 3 π R ^ 3. By using the definition of derivative, it is proved that the surface area of the sphere is s = 4 π R ^ 2