Numbers

a 제곱이 짝수라면 a는 짝수일 수 밖에 없습니다. 정말 그런지 증명을 해볼까요? 한번 반대로 생각해 봅시다. 만약 a가 홀수일 때 a 제곱은 짝수가 될 수 있을까? 만약 a가 홀수일 때, a 제곱이 짝수가 되는지 증명해보겠습니다. a가 홀수인 것을 식으로 나타내면 아래와 같이 나타낼 수 있습니다. a = 2k - 1 (단, k는 자연수) 그럼 a 제곱은 아래와 같이 나타낼 수 있습니다. a제곱 = (2k - 1)제곱 = (2k - 1)(2k - 1) = 4k제곱 - 4k + 1 = 2(2k제곱 - 2k) + 1 2(2k제곱-2k)는 2의 배수인데 여기에 +1을 했으므로 a제곱은 짝수가 아니게 됩니다. 따라서 a가 홀수일 때는 a제곱은 홀수가되며 짝수가 될 수 없습니다. 그러므로 a가 짝수일 때 a제곱도 짝수임을 증명할 수 있습니다.

What good is a number without context? — Take the number 42. Apart from it being the meaning of life, it’s a pretty cool number. But, 42 euros or 42 km are two different quantities and 42 wei is an entirely different category. If you see a € or $ sign next to a number in modeling software…

It is often assumed that swapping two numbers requires the use of a temporary variable. However, this is not always the case! There are a few ways to swap two numbers without using a temporary variable, which can be useful in certain situations. In this article, we will discuss two…

“A single switch can be on or off, enabling the storage of 1 bit of information. Switches can be grouped together to store larger numbers. This is the key reason why binary is used in digital systems.” Clearly, this answer is unsatisfying because it doesn’t answer the question “what made…

In this come follow me I chose a few topics I want to stick with most due to time consumption and the amount of material that is being covered. First off before we start of in this section of Numbers I want to go over a few details that might…