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Five times of a number minus 14 equals two times of his plus four. What's the number? You don't need equations, you need to write equations
（14+4）÷（5-2）
=18÷3
=6
Write several successive addition and subtraction formulas with four numbers 2, 3, 4 and 9
2 x 3 x 4 = 9
The solution of a series of equations: three times of a certain number minus five is equal to the number plus nine______ ．
Let this number be x, & nbsp; & nbsp; 3x-5 = x + 9, & nbsp; 3x-5-x = x + 9-x, & nbsp; & nbsp; & nbsp; & nbsp; 2x-5 = 9, & nbsp; 2x-5 + 5 = 9 + 5, & nbsp; & nbsp; & nbsp; & nbsp; 2x = 14, & nbsp; 2x △ 2 = 14 △ 2, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 7
After a number is quadrupled, add 124, then divide by 2, and then subtract 160 of 20?
[(160+20)*2-124]/4=59
If M and N are opposite to each other, then 5m plus 5N minus 5 equals ()
a+3,-5
What are the characteristics of numbers divisible by 4, 9, 11 and 25
What is the number divisible by 4, 9, 11, 25
Divisible by 4: the last two digits are multiples of 4
Divisible by 9: the sum of numbers is a multiple of 9
Divisible by 11: if the difference between odd digit sum and even digit sum is a multiple of 11 (including 0), it can be divisible by 11
Divisible by 25: the last two digits are multiples of 25 (including 00)
What are the characteristics of numbers divisible by 3? According to this method, can we find out the characteristics of numbers divisible by 9?
Not only the answer, but also the reason
The number divisible by 3 is the sum of all the numbers is a multiple of 3
For example, 123 = 1 + 2 + 3 = 6 is a multiple of 3
The sum of all the numbers divisible by 9 is a multiple of 9
Example 108 = 1 + 0 + 8 = 9
216=2+1+6=9
I hope I can help you,
What are the characteristics of numbers that can be divided by 7, 9 and 11 at the same time?
It's a multiple of 7 times 9 times 11
Find the sum of all numbers divisible by 7 between 200 and 400
200/7=28...4
400/7=57...1
The sum of all numbers divisible by 7 between 200 and 400
7(28+29+...+56+57)
=7*30(28+57)/2
=8925
Characteristics of numbers divisible by 17 and 23
Characteristics of numbers divisible by 17
1. If the number of one digit of an integer is truncated, and then five times of the number of one digit is subtracted from the remaining number, if the difference is a multiple of 17, then the original number can be divided by 17. If the difference is too large or it is difficult to see whether it is a multiple of 17 by mental arithmetic, we need to continue the above process of "truncation, multiplication, subtraction and difference checking" until we can make a clear judgment
2. If the difference between the last three digits of an integer and the preceding number of 3 times can be divided by 17, then the number can be divided by 17
Characteristics of numbers divisible by 23
If the difference between the last four digits of an integer and the first five times of the number separated can be divided by 23 (or 29), then the number can be divided by 23
RELATED INFORMATIONS
- 1. Put the nine numbers from 11 to 19 in nine squares and make them equal to 45
- 2. () multiply 3 () plus 100 () divide 4 () minus 16 () plus 36 equals 60 There is another: () plus 504 () divided by 9 () multiplied by 50 equals 3850
- 3. Calculate a number minus nine fourths equals seven thirds. What's the number?
- 4. How many times is 40 equal to two identical numbers
- 5. Is 0 times infinity equal to 0 For example, 0 ×∞ =
- 6. If a multiplied by 2 / 3 equals B multiplied by 40% (a, B is a natural number not equal to 0), then how much is a equal to B
- 7. 279 is the sum of four numbers of a, B, C and D. if a is reduced by 2, B is increased by 2, C is divided by 2, D is multiplied by 2, then all four numbers are equal, then a is a______ B is______ (c) yes______ Yes, Ding______ ．
- 8. A, B, C and d make 270 parts. If a makes 10 more parts and B makes 10 less parts, multiply the number of parts made by C by 2 and divide the number of parts made by D by 2, There are 270 parts made by four people. If a makes 10 more parts and B makes 10 less parts, the number of parts made by C is multiplied by 2, and the number of parts made by D is divided by 2, then the number of parts made by four people is exactly the same. Try to calculate the number of parts made by a, B, C and d by equation
- 9. 25% of a is equal to 20% of B. A is greater than B. B is greater than A. C is equal to B Finally, tell the answer
- 10. High number. To find the limit infinity divided by infinity is equal to one? Constant if you take infinity as infinity, is it equal to infinity? Or that constant
- 11. In a proportion, two external terms are reciprocal to each other. If one internal term is 2, what is the other internal term?
- 12. It is known that both the internal and external terms of a proportion are natural numbers, and the product of the two external terms is 30. What are the two internal terms
- 13. The difference between the product of two internal terms minus the product of two external terms in a proportion is zero______ (judge right or wrong)
- 14. What is 1 minus minus 0.6
- 15. 5 / 6 of a number is equal to the sum of 3 1 / 7. What is the number? To solve the equation with
- 16. Fill in 10 numbers o, 1.2.3.4.6.7.8.9.10. Each number can only be used once
- 17. 4 / 7 of a number is equal to the difference between 14 and 6
- 18. The quotient of division of two reciprocal numbers is 4 / 81, and the sum of these two numbers is () Hurry!
- 19. It is known that a × 3 and 7 / 3-11 / 12 × B = C, and that a, B and C are not equal to 0?
- 20. Use the five numbers 2,7,0,5,1 to form a five digit number. (1) what is the smallest number about 30000? (2) about 7 Use the five numbers 2, 7, 0, 5 and 1 to form a five digit number (1) What is the minimum number of 30000? (2) What is the largest number about 70000? Ask for detailed explanation!