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\(\left(a+b+c\right)\left(ab+bc+ca\right)-abc\)
\(=\left(a+b+c\right)\left(ab+bc\right)+\left(a+b+c\right)ac-abc\)
\(=\left(ab+b^2+bc\right)\left(a+c\right)+\left(a+c\right)ac+abc-abc\)
\(=\left(a+c\right)\left(ab+b^2+bc+ac\right)\)
\(=\left(a+b\right)\left(b+c\right)\left(c+a\right)\)
a) \(bc\left(b+c\right)+ca\left(c-a\right)-ab\left(a+b\right)\)
\(=bc\left(b+c\right)+ca\left(c-a\right)-ab\left[\left(b+c\right)-\left(c-a\right)\right]\)
\(=bc\left(b+c\right)+ca\left(c-a\right)-ab\left(b+c\right)+ab\left(c-a\right)\)
\(=\left(b+c\right)\left(bc-ab\right)+\left(c-a\right)\left(ca+ab\right)\)
\(=\left(b+c\right)\left(c-a\right)b+\left(c-a\right)\left(b+c\right)a\)
\(=\left(b+a\right)\left(c-a\right)\left(c+b\right)\)
b) \(a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)\)
\(=a^2\left(b-c\right)+b^2\left(c-a\right)-c^2\left[\left(b-c\right)+\left(c-a\right)\right]\)
\(=a^2\left(b-c\right)+b^2\left(c-a\right)-c^2\left(b-c\right)-c^2\left(c-a\right)\)
\(=\left(b-c\right)\left(a^2-c^2\right)+\left(c-a\right)\left(b^2-c^2\right)\)
\(=\left(b-c\right)\left(a-c\right)\left(a+c\right)+\left(c-a\right)\left(b-c\right)\left(b+c\right)\)
\(=\left(b-c\right)\left(c-a\right)\left(b+c-a-c\right)\)
\(=\left(b-a\right)\left(b-c\right)\left(c-a\right)\)
a) =a2b - ab2 + b2c - bc2 + a2c - ac2
= abc +a2b - ab2 +b2c - bc2 +a2c - ac2 - abc
= (a2b - abc) - (ab2 - b2c) - (bc2 - ac2) - (a2c - abc)
= ab(a - c) - b2(a - c) - c2(b - a) - ac(a - b)
= [ab(a - c) - b2(a - c)] + [c2(a - b) - ac(a - b)]
= (a - c)(ab - b2) + (a - b)(c2 - ac)
= b(a - c)(a - b) + c(a - b)(c - a)
= b(a - c)(a - b) - c(a - b)(a - c)
= (a - c)(a - b)(b - c)
b)= ab2 - ac2 + bc2 - a2b + a2c - b2c
= abc + ab2 - ac2 + bc2 - a2b + a2c - b2c - abc
= (ab2 - abc) + (abc - ac2) - (b2c - bc2) - (a2b - a2c)
= ab(b - c) + ac( b - c) - bc(b - c) - a2(b - c)
= (b - c)(ab + ac - bc - a2)
= (b - c) [(ab - bc) + (ac - a2)]
= (b - c) [b(a - c) +a(c - a)]
= (b - c) [b(a - c) - a(a - c)]
= (b - c)(a - c)(b - a)
c) = ab3 - ac3 + bc3 - a3b + a3c - b3c
= a2bc + ab2c + abc2 + a3b + a2b2 + a2bc - a3c - a2bc - a2c2 + a2c2 + abc2 + ac3 - a2b2
- ab3 - ab2c + ab2c + b3c + b2c2 - abc2 - b2c2 - bc3 - a2bc - ab2c - abc2
= (a2bc + ab2c + abc2) +(a3b + a2b2 + a2bc) - (a3c - a2bc - a2c2) +(a2c2 + abc2 +ac3) -
(a2b2 + ab3 + ab2c) + (ab2c + b3c + b2c2) - (abc2 + b2c2 + bc3) - (a2bc + ab2c + abc2)
= abc(a + b + c) +a2b(a + b + c) - a2c(a + b + c) + ac2(a + b + c) - ab2(a + b + c) + b2c(a + b + c) - bc2(a + b + c) - abc(a + b+ c)
= (a +b +c)(abc + a2b - a2c + ac2 - ab2 + b2c - bc2 - abc)
= (a + b+ c) [(a2b - abc)+(abc - bc2) - (a2c - ac2) - (ab2 - b2c)]
= (a + b + c) [ab(a - c) + bc(a - c) - ac(a - c) - b2(a - c)]
= (a + b + c)(a - c)(ab + bc - ac - b2)
= (a +b + c)(a - c) [(ab - ac) - (b2 - bc)]
= (a + b+ c)(a - c) [a(b - c) - b(b - c)]
= (a + b + c)(a - c)(b - c)(a - b)
trời ơi sao câu c dài thế !!!!! Tui có bài giống vậy nhưng nó ra p/số, còn phải ghi nhiều hơn 
a) x3+y3+z3-3xyz
=(x+y)3+z3-3x2y-3xy2-3xyz
=(x+y+z).[(x+y)2+(x+y).z+z2]-3xy.(x+y+z)
=(x+y+z)(x2+2xy+y2+zx+zy+z2)-3xy.(x+y+z)
=(x+y+z)(x2+2xy+y2+zx+zy+z2-3xy)
=(x+y+z)(x2+y2+zx+zy+z2-zy)
b)a2(b-c)+b2(c-a)+c2(a-b)
=a2b-a2c+b2c-b2a+c2a-c2b
=(a2b-c2b)+(-a2c+c2a)+(b2c-b2a)
=b.(a2-c2)-ac.(a-c)-b2.(a-c)
=b.(a+c)(a-c)-ac.(a-c)-b2.(a-c)
=(a-c)[b.(a+c)-ac-b2]
=(a-c)(ab+bc-ac-b2)
=(a-c)[(ab-ac)+(bc-b2)]
=(a-c)[a.(b-c)-b.(b-c)]
=(a-c)(b-c)(a-b)