//递归法求最大公约数#include<iostream>using namespace std;//递归函数int greatestCommonDivisor(int a,int b){ return (a % b == 0) ? b : greatestCommonDivisor(b, a % b);}int main(){ int a, b; cin >> a >> b; int greatestComDiv = greatestCommonDivisor(a, b); int leastComMul = a * b / greatestComDiv;...