Trong không gian với hệ trục tọa độ , cho điểm và đường thẳng . Tọa độ điểm là hình chiếu vuông góc của điểm lên đường thẳng là:

Giải thích

Đường thẳng có vecto chỉ phương u   → = 2 ; - 1 ;   2 " 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" style="width: 115.00px; height: 24.00px; margin-left: -0.00px; margin-top: 0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title="begin mathsize 18px style stack u space with rightwards arrow on top equals open parentheses 2 semicolon minus 1 semicolon space 2 close parentheses end style"> . Vì nên u   → . K M → = 0 " 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" style="width: 65.00px; height: 20.00px; margin-left: 0.00px; margin-top: 1.11px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title="stack u space with rightwards arrow on top. stack K M with rightwards arrow on top equals 0"> ⇔ 2 1 - 2 t - t + 2 1 - 2 t = 0 ⇔ - 9 t + 4 = 0 ⇔ t = 4 9 " 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style="width: 212.00px; height: 89.00px; margin-left: 0.00px; margin-top: 0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title="left right double arrow 2 open parentheses 1 minus 2 t close parentheses minus t plus 2 open parentheses 1 minus 2 t close parentheses equals 0 left right double arrow negative 9 t plus 4 equals 0 left right double arrow t equals 4 over 9"> . Chọn B.