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It can't be replaced by X. it can only be replaced by ordinary multiplication, division, addition and subtraction,
The number of strawberries is even
The number of hedgehogs is singular
There are three hedgehogs and four strawberries
Operation rules of significant numbers multiplication and division
Let's go straight to Baidu
Operation rules of significant number multiplication and division
1.5*10^8*6.1*10^8/3.3*10^5
I know that first think of the significant number as two, and then, 10 ^ 8 times, who will
The significant number of the number represented by scientific counting method is only the number before 10 ^ 8
So these three numbers are all two significant digits, so there is no need to round them
If the calculation result is two, I will not count it
RELATED INFORMATIONS
- 1. Some problems about arithmetic of significant number Is the operation process of 8.0421 / (6.038-6.034) + 30.9 like this?: 6.038-6.034 = 0.004 8.0421/0.004 = 2205.25 (since the least significant digit is one, the result should also retain one significant digit, so the original formula is about 2 * 10 ^ 3? So it can be added to 30.9. According to the highest suspicious digit, is the result still 2 * 10 ^ 3? There is another problem, Is the approximate number of 2205.25 taken first and then added by 30.9, or is the approximate number of 2205.25 and 30.9 taken first and then added by 30.9?
- 2. Fill in addition, multiplication, division, addition, subtraction and brackets to get the following answer. 123456 = 5
- 3. Numbers and algebraic expressions and equations (2) there are filling in the blanks and practical problems, within 10 minutes (multiplier sign: ×, division sign: △) Fill in the blanks: 1. Read a book, N pages a day, () 100 pages a day Xiao Xia is x years old and her father is (x + y years old). Ten years later, her father is () years older than Xiao Xia Fill in the blank ③ when m = 5, 5m = (), 5m + 1 = () There is a book. Xiaohua read 25% of it on the first day and one third of it on the second day. There are 120 pages left. How many pages are there in this book? There are 50 passengers on the bus. According to the conductor, the income of 1 yuan is 20 yuan more than that of 1.5 yuan. How many passengers buy 1.5 yuan tickets?
- 4. Take 1, 2, 3 and 4 and arrange them in a row from small to large. Insert a multiplier sign between these four numbers to get () different products This is a difficult math problem
- 5. 7 * 7, how to omit the multiplication sign?
- 6. Omit the multiply sign. A times 2 times B
- 7. Omit the multiplication sign and abbreviate the following expressions a × t m × n
- 8. X × y =? Omit multiplier sign
- 9. The multiplication sign between two identical letters can not only be omitted, but also be written and read. What is the meaning?
- 10. Can I write the letters before the numbers when I use the dot multiplier? Why?
- 11. Multiply a number by 10, the number is 36 more than the original number, the original number is []
- 12. Add addition, subtraction, multiplication and division or brackets to the appropriate place of the following formula to make the formula hold. 4 = 5
- 13. Cut out a square of the same size at each corner of the square paperboard with side length of 16 cm, and fold it into the sum of a cuboid without cover. 1. If the side length of the cut small square is xcm, please use X to indicate the volume of the carton. 2. When the side length x of the cut small square is 3cm and 3.5cm respectively, the volume of the two folded open cuboid cartons is compared.
- 14. On the addition and subtraction of rational numbers: (+ 9) - (+ 21) (2) (- 12) - (+ 18) (3) 0 - (- 63) (4) (- 32) - 0 (5) (- 5.4) - 2.8 And: (6) (+ 37.9) - (- 5.1) (7) (- 15) - (8-9) (8) (8-2) - (14-9)
- 15. Mixed operation of rational number addition and subtraction (+ 7 / 4) + (- 1 / 4) - (+ 16 / 7) - (- 16 / 7)
- 16. The subtraction rule of rational number is: subtracting a number is equal to what is the opposite of this number
- 17. Must negative numbers be rational numbers
- 18. How to calculate negative number before bracket when merging similar items?
- 19. Negative numbers in parentheses Merge similar items and evaluate them! For example: - b-7ab. Suppose B is 2 and a is 3, what is the format? - B need to add brackets?
- 20. -What is the square of 2? What is the square of (- 2)? Is the square of a negative number negative as long as there are no brackets?