a*b*(a - b) + a*c*(c - a) + b*c*(b - c)
$$a b \left(a - b\right) + a c \left(- a + c\right) + b c \left(b - c\right)$$
c*(a*(c - a) + b*(b - c)) + a*b*(a - b)
$$a b \left(a - b\right) + c \left(a \left(- a + c\right) + b \left(b - c\right)\right)$$
a*(b*(a - b) + c*(c - a)) + b*c*(b - c)
$$a \left(b \left(a - b\right) + c \left(- a + c\right)\right) + b c \left(b - c\right)$$
b*(a*(a - b) + c*(b - c)) + a*c*(c - a)
$$a c \left(- a + c\right) + b \left(a \left(a - b\right) + c \left(b - c\right)\right)$$