[рони]

StasChis,

const findMax = (arr, min, max) => arr.filter(a => a >= min && a <= max).sort((a, b) => b - a)[0]
const arr = [1500, 1900, 2000, 1703, 1805, 1600, 1690];
const min = 1600;
const max = 1800;
const num = findMax(arr, min, max);
alert(num);