a)
AN = AC + CN
= 4/4 AC - 1/4 AC
= 3/4 AC
b)
MN = MA + AN
= -3/4 AB + 3/4 AC
= 3/4 (AC - AB)
3)
MN = = 3/4 (AC - AB)
= - 3/4 (CA + AB)
= -3/4 CB
= 3/4 BC
En espérant t'avoir aidé.
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a)
AN = AC + CN
= 4/4 AC - 1/4 AC
= 3/4 AC
b)
MN = MA + AN
= -3/4 AB + 3/4 AC
= 3/4 (AC - AB)
3)
MN = = 3/4 (AC - AB)
= - 3/4 (CA + AB)
= -3/4 CB
= 3/4 BC
En espérant t'avoir aidé.