编写重载函数Max1 可分别求取两个整数，三个整数，两个双精度数，三个双精度数的最大值。

好的，这个问题也比较简单。下面是代码实现：

#include <iostream>
using namespace std;

int Max1(int a, int b) {
    return a > b ? a : b;
}

int Max1(int a, int b, int c) {
    int max_num = a;
    if (b > max_num) max_num = b;
    if (c > max_num) max_num = c;
    return max_num;
}

double Max1(double a, double b) {
    return a > b ? a : b;
}

double Max1(double a, double b, double c) {
    double max_num = a;
    if (b > max_num) max_num = b;
    if (c > max_num) max_num = c;
    return max_num;
}

int main() {
    int a = 1, b = 2, c = 3;
    double d = 1.0, e = 2.0, f = 3.0;
    cout << "max of 2 integers: " << Max1(a, b) << endl;
    cout << "max of 3 integers: " << Max1(a, b, c) << endl;
    cout << "max of 2 doubles: " << Max1(d, e) << endl;
    cout << "max of 3 doubles: " << Max1(d, e, f) << endl;
    return 0;
}

输出结果为：

max of 2 integers: 2
max of 3 integers: 3
max of 2 doubles: 2
max of 3 doubles: 3

我们可以看到，重载函数 `Max1` 可以分别处理不同数量和类型的数据，并且测试结果也证明它们的功能是正确的。