Sujet 2014 - Lycée d`Altitude

2×3
L[BC]ABC AL
CM
[
ALC
(AL) (CM )

ABCD
M N [AD] [CD]
\
ABN
\
CBM (AC ) (M N )
a b c d
ab +cd =ac −10bd.
ABCD A D [AB] [BC] [C D]
[AC]A C
[BD]B D
O