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Answers for “为什么最后一个非零余数等于最大公约数?”

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To find the greatest common divisor of two large numbers, repeatedly apply the division-with-remainder step. Start by dividing the larger number by the smaller number.

Conditions: The inputs are two positive integers.; The division algorithm is applied at each step.; The process stops when a remainder equals 0.

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To compute gcd⁡(5295,4321)\gcd(5295, 4321), apply the Euclidean algorithm by repeatedly dividing the previous divisor by the previous remainder. Start with 5295=1⋅4321+9745295 = 1 \cdot 4321 + 974.

Conditions: The inputs are 5295 and 4321.; The Euclidean algorithm is used.; The division algorithm is applied at each step.

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The Euclidean algorithm computes the greatest common divisor by repeatedly applying the division algorithm. Starting with two natural numbers aa and bb, you divide the larger by the smaller to get a quotient and a remainder.

Conditions: The inputs aa and bb are natural numbers.; The division algorithm is applied repeatedly.; The process stops when a remainder equals 0.

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When the Euclidean algorithm yields a greatest common divisor of 1, it means the two input numbers are relatively prime (or coprime). This indicates that they share no common positive integer divisors other than 1.

Conditions: The inputs are natural numbers.; The Euclidean algorithm terminates with a last nonzero remainder of 1.

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Strictly speaking, the standard stopping condition for the Euclidean algorithm is to continue until the remainder is 0. The last nonzero remainder is then the gcd.

Conditions: The inputs are natural numbers.; The Euclidean algorithm is being applied.

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In the displayed Euclidean algorithm, aa and bb are the two initial natural numbers whose gcd is being found. qiq_i represents the quotient at the ii-th division step.

Conditions: The symbols are from the general statement of the Euclidean algorithm on the left board.

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The Euclidean algorithm is a method for finding the greatest common divisor (gcd) of two natural numbers. It is set up by repeatedly applying the division algorithm.

Conditions: The inputs aa and bb are natural numbers.; The division algorithm is used at each step.