Answer:
ab(a-b)+bc(b-c)+ca(c-a)
= (-1)×(-2)(-1-(-2))+(-2)×(-3)(-2-(-3))+(-3)×(-1)(-3-(-1))
=2(-1+2)+6(-2+3)+3(-3+1)
=2(1)+6(1)+3(-2)
=2+6-6=2
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Answer:
ab(a-b)+bc(b-c)+ca(c-a)
= (-1)×(-2)(-1-(-2))+(-2)×(-3)(-2-(-3))+(-3)×(-1)(-3-(-1))
=2(-1+2)+6(-2+3)+3(-3+1)
=2(1)+6(1)+3(-2)
=2+6-6=2