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|AB|²=(4+3)²+(-1+5)²=49+16=65
|BC|²=(-2-4)²+(3+1)²=36+16=52
|AC|²=(-2+3)²+(3+5)²=1+64=65
|AB|=|AC|=√65
2.
(3+3+5+6+x)/5=4
17+x=5*4
x=20-17
x=3
3,3,3,5,6
Mediana 3