Trong không gian với hệ tọa độ Oxyz cho hai điểm $A(x_A; y_A; z_A)$ và $B(x_B; y_B; z_B)$. Tìm tọa độ điểm M chia đọan thẳng AB theo tỉ số k ( tức $MA=kMB)$ với $k\neq 1$
Điểm M$(x; y; z)$ chia đoạn thẳng AB theo 1 tỷ số k tức là:
$\overrightarrow{MA}=k \overrightarrow{MB}   \Leftrightarrow  (x_A-x;y_A-y; z_A-z)=k(x_B-x; y_B-y; z_B-z)$
$\Leftrightarrow \begin{cases}x_A-x=k(x_B-x)\\ y_A-y=k(y_B-y)\\z_A-z=k(z_B-z) \end{cases}$
$\Leftrightarrow \begin{cases}x=\frac{x_A-kx_B}{1-k} \\ y=\frac{y_A-ky_B}{1-k}\\z=\frac{z_A-kz_B}{1-k} \end{cases}$

Vậy $M(\frac{x_A-kx_B}{1-k}; \frac{y_A-ky_B}{1-k};\frac{z_A-kz_B}{1-k})$

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