Răspunsuri

2014-09-16T16:25:22+03:00
Daca vectorii sunt coliniari punem conditia \frac{x_{1} }{  x_{2}  } } = \frac{ y_{1} }{y_{2} } .

 \frac{2}{3} = \frac{a}{a-2}
2(a-2)=3a
2a-4=3a
2a-3a=4
-a=4 ⇒a=-4
2 5 2