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Toán 12: Trong không gian Oxyz, cho điểm A(1;1;-1) và đường thẳng d: {x-4}{2}={y-4}{2}={z-2}/{-1}.
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Trong không gian \(Oxyz\), cho điểm \(A(1;1;-1)\) và đường thẳng \(d:\frac{x-4}{2}=\frac{y-4}{2}=\frac{z-2}{-1}\). Gọi \(H(a;b;c)\) là hình chiếu vuông góc của điểm \(A\) trên đường thẳng \(d\). Tính tổng \(a+b+c\).
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