Zadanie1
function mathInfo() {
    var randomNumber = Math.floor(Math.random() * 100);

    console.log(randomNumber % 2 == 0, randomNumber);

    for (var i = 1; i <= Math.floor(randomNumber / 2); i++) {
        if (randomNumber % i == 0) {
            console.log(i, 'dzielnik');
        }
    }

    var res = randomNumber % 5;
    console.log(Math.pow(randomNumber, res));
}

mathInfo();
/////
Zadanie2
function myEval(a, b, operation) {
    var result = 0;
    switch (operation) {
        case'+':
            result = a + b;
            break;
        case'-':
            result = a - b;
            break;
        case'/':
            result = a / b;
            break;
        case'*':
            result = a * b;
            break;
        case'%':
            result = a % b;
            break;
        case'^':
            result = Math.pow(a, b);
    }
    return result;
}

console.log(" 2 + 4 = " + myEval(2, 4, "+"));
console.log(" 5 - 2 = " + myEval(5, 2, "-"));
console.log(" 4 ^ 8 = " + myEval(4, 8, "^"));
console.log(" 8 % 3 = " + myEval(8, 3, "%"));