If 1013 < x < 1014 and x is a natural number, x has .... digit(s)
If 10^13 < x < 10^14 and x is a natural number then x has ...... digit(s)
x = 99...999 (14 chữ số 9)
--> x has fourteen digits
có nhiều số nhưng những số đó phải có 14 chữ số
giúp mình với:
If 10^13< x < 10^14 and x is a natural number then x has .................. digit(s)
If 1013 < x < 1014 and x is a natural number then x has ... digit(s)
if 1013<x<1014 and x is a natural number then x has ..................... digit
Vì 1013 là số nhỏ nhất có 14 chữ số
Và 1014 là số nhỏ nhất có 15 chữ số
Vậy x có 14 chữ số
A natural number has six digits and the units digit is 4.If the units digit is moved to the first row then the number will be increasedby 4 times.The number is
A,B,C,D,A+C,B+C,A+D,B+D represent 8 diffirent natural numbers from 1 to 8. If A is the largest number in the number from 1 to 8.Find A
How many natural numbers are there between 100 and 999 that unit-digit and tens-digit equal hundreds-digit ?
Exer 1: Given two natural numbers whose sum are 78293. The bigger number where 5 is the units digit and 2 is hundred digit. If we clean these digits then we obtain a number which equals the smaller number. Find two natural numbers.
Exer 2: Prove that: If x, y \(\in\) N and x + 2y divisible by 5 then 3x - 4y divisibles by 5.
Exer 3: Given that 2x + 5y \(⋮\) 7. Prove that 4x + 3y \(⋮\) 7.
Exer 1:
Solution:
Suppose that, the unknown number is: \(\overline{x215}\) (where x \(\in\) N).
When we clean three digits then the smaller number is \(\overline{x}\).
We have: \(\overline{x215}\) + \(\overline{x}\) = 78293
\(\Rightarrow\) 1000. \(\overline{x}\) + 215 + \(\overline{x}\) = 78293
1001. \(\overline{x}\) = 78078
x = 78
Thus, we found two natural number: 78215 and 78.
Exer 2:
Solution:
We have: x + 2y \(⋮\) 5
\(\Rightarrow\) 2x + 4y \(⋮\) 5
(2x + 4y) + (3x - 4y) = 5x \(⋮\) 5
\(\Rightarrow\) 2x + 4y \(⋮\) 5
Deduce 3x - 4y \(⋮\) 5.
Exer 3:
Solution:
We have: 2x + 5y \(⋮\) 7
4x + 10y \(⋮\) 7
(4x + 10y) - (4x + 3y) = 7y \(⋮\) 7
\(\Rightarrow\) 4x + 10y \(⋮\) 7
Deduce 4x + 3y \(⋮\) 7.
A natural number will be increased by 9 times ifthe digit 0 is written between tens digit and units digit.The number is
find a four-digit natural number that is less than 2015. If the thousands digit it erase, the number will be decreased by 9 time
có ai biết câu trả lời chính xác ko?Giúp dùm mình
tìm một số tự nhiên có bốn chữ số ít hơn so với 2015. Nếu xóa chữ số hàng nghìn thì số đó sẽ giảm 9 lần.
Từ đó ta biết số đó là 1125.