D =√[ (-3-x)² +(y-2)² ]
=√(9+6x+x²+y²-4y+4)
distance entre les 2 points =√(x²+6x+y²-4y+13)
2)
[(x-y)-(x-z)] - [(z-y) - (x+z)]
=[(x-y-x+z)] - [(z-y - x-z)]
=[(x- y- x + z- z+ y + x+z)]
= x+z
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1)
(x;y) et (-3;2)
D =√[ (-3-x)² +(y-2)² ]
=√(9+6x+x²+y²-4y+4)
distance entre les 2 points =√(x²+6x+y²-4y+13)
2)
[(x-y)-(x-z)] - [(z-y) - (x+z)]
=[(x-y-x+z)] - [(z-y - x-z)]
=[(x- y- x + z- z+ y + x+z)]
= x+z