a)A(1,-2),B(0,-5) e C(2,1)
b)A(1,3), B(2,5), C(-2,0)
Com cálculos por favor [Melhor resposta escolhida hoje mesmo]
l 1 -2 1 l
l 0 5 1 l
l 2 1 1 l=
-5-4+0-(0+1-10)=
-9-(-9)=
-9+9=0
são colineares
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Verified answer
l 1 -2 1 l
l 0 5 1 l
l 2 1 1 l=
-5-4+0-(0+1-10)=
-9-(-9)=
-9+9=0
são colineares