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E

eye_smile

K thuộc Oy nên K(0;y)

$\vec{AB}=(-3;4)$

$\vec{AK}=(-1;y-2)$

A;B;K thẳng hàng \Rightarrow $4=3(y-2)$

\Rightarrow $y=\dfrac{4}{3}+2$
 
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