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最小公倍数

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For adding fractions: LCD (Least Common Denominator) = LCM of all denominators. 1/4 + 1/6 + 1/3: LCM(4,6,3) = 12 → 3/12 + 2/12 + 4/12 = 9/12 = 3/4.

难度:中级

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The Chinese Remainder Theorem (3rd century CE) uses LCM to solve systems of modular equations. It is used today in cryptography, computer science, and was used historically to count soldiers without asking them to line up.

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