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tongcua2duongcheocuamang.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
let arr = [[1, 3, 4, 5], [-2, -3, -4, -5], [8, 9, 10, 11], [0, 2, 8, 9]];
let sumXuong = 0;
let sumTren = 0;
for (let i = 0; i < arr.length; i++) {
console.log(arr[i])
for (let j = 0; j < arr[i].length; j++) {
if (i == j) {
sumXuong += arr[i][j];
}
if (i + j == (arr.length - 1)) {
sumTren += arr[i][j];
// console.log(arr[i][j]);
}
}
}
//console.log(arr);
document.write(sumXuong + sumTren);
// let arr = new Array(4);
// let sumXuong = 0;
// let sumTren = 0;
// for (let i = 0; i < arr.length; i++) {
// arr = new Array([1, 3, 4, 5], [-2, -3, -4, -5], [8, 9, 10, 11], [0, 2, 8, 9])
// console.log(arr[i])
// for (let j = 0; j < arr[i].length; j++) {
// if (i == j) {
// sumXuong += arr[i][j];
// }
// if (i + j == (arr.length - 1)) {
// sumTren += arr[i][j];
// // console.log(arr[i][j]);
// }
// }
// }
</script>
</body>
</html>