đoạn 1:

S=10

n=5

đoạn 2:

n=4

s=12

đoạn 3:

n=6

s=15

đoạn 4:

n=5

s=22

$\text{a)}$

\begin{array}{|c|c|c|}\hline \text{Lần lặp}&\text{n}&\text{s}\\\hline \text{}&\text{2}&\text{5}\\\hline \text{1}&\text{3}&\text{8}\\\hline \text{2}&\text{4}&\text{12}\\\hline \text{3}&\text{5}&\text{17}\\\hline\end{array}

$\text{b)}$

\begin{array}{|c|c|c|}\hline \text{Lần lặp}&\text{n}&\text{s}\\\hline \text{}&\text{1}&\text{3}\\\hline \text{1}&\text{2}&\text{5}\\\hline \text{2}&\text{3}&\text{8}\\\hline \text{3}&\text{4}&\text{12}\\\hline\end{array}

$\text{c)}$

\begin{array}{|c|c|c|}\hline \text{Lần lặp}&\text{Điều kiện}&\text{n}&\text{s}\\\hline \text{}&\text{Đ}&\text{2}&\text{5}\\\hline \text{1}&\text{Đ}&\text{4}&\text{9}\\\hline \text{2}&\text{Đ}&\text{6}&\text{15}\\\hline \end{array}

$\text{d)}$

\begin{array}{|c|c|c|}\hline \text{Lần lặp}&\text{n}&\text{s}\\\hline \text{}&\text{}&\text{7}\\\hline \text{1}&\text{1}&\text{8}\\\hline \text{2}&\text{2}&\text{10}\\\hline \text{3}&\text{3}&\text{13}\\\hline \text{4}&\text{4}&\text{17}\\\hline \text{5}&\text{5}&\text{22}\\\hline \text{6}&\text{6}&\text{28}\\\hline \text{7}&\text{7}&\text{35}\\\hline\end{array}