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PHP Vòng lặp for tính tổng S(n) = x*2 + x*4 + ⋯ + x*2n
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PHP Vòng lặp for tính tổng S(n) = x*2 + x*4 + ⋯ + x*2n
Hãy sử dụng vòng lặp for mà bạn đã học để giải bài toán tính tổng theo công thức dưới đây:
S(n) = x*2 + x*4 + ... + x*2n
Bài giải
-------------------- ######## --------------------
Đề bài yêu cầu sử dụng vòng lặp for nên mình sẽ giải bằng vòng lặp for nhé.
Bài viết này được đăng tại freetuts.net , không được copy dưới mọi hình thức.
Chúng ta cần hai biến, thứ nhất là biến n
và thứ hai là biến x
.
Tại mỗi lần lặp ta sẽ tính giá trị bằng công thức si = x*2i
, với i là lần lặp hiện tại.
Sau đây là bài giải cụ thể.
Bài viết này được đăng tại [free tuts .net]
// Giả sử n = 50, x = 5
$n = 50;
$x = 5;
// Khai báo biến tổng và gán giá trị ban đầu = 0
$tong = 0;
// Bắt đầu lặp và cộng dồn vào biến tổng
for ($i = 1; $i <= $n; $i++){
$tong += $x * (2 * $i);
}
// In kết quả
echo "Tổng là: " . $tong;
echo '<br/> Freetuts.net chúc bạn học tốt';
Kết quả:
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