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A = a^2b+ab^2+b^2c+bc^2+c^2a+ca^2+3abc
= (a^2b+ab^2+abc)+(b^2c+bc^2+abc)+(c^2a+ca^2+abc)
= (a+b+c).(ab+bc+ca)
k mk nha
( a + b ) ( b + c ) ( c + a ) + abc
= ( ab + ac + b^2 + bc ) ( c + a ) + abc
= ( c + a ) ( ab + ac + b^2 + bc ) + abc
= abc + ac^2 + b^2c + bc^2 + a^2b + a^2c + ab^2 + abc + abc
= 3abc + a . c^2 + b^2 . c + b . c^2 + a^2 . b + a^2 . c + a . b^2
= 3abc + c^2( a + b ) + b^2( c + a ) + a^2 ( b + c )
a3(c - b2) + b3(a - c2) + c3(b - a2) + abc(abc - 1)
= a3c - a3b2 + ab3 - b3c2 + bc3 - a2c3 + a2b2c2 - abc
= a2b2c2 - b3c2 - (a2c3 - bc3) - (a3b2 - ab3) + (a3c - abc)
= b2c2(a2 - b) - c3(a2 - b) - ab2(a2 - b) + ac(a2 - b)
= (a2 - b)(b2c2 - c3 - ab2 + ac) = (a2 - b)[c2(b2 - c) - a(b2 - c)] = (a2 - b)(b2 - c)(c2 - a)
a) a2(a-b)-b2(a-c)-c2(b-a)
=a2(a-b)-b2(a-c)+c2(a-b)
=(a-b)(a2-c2)-b2(a-c)
=(a-b)(a-c)(a+c)-b2(a-c)
=(a-c)[(a-b)(a+c)-b2]
b)a(b-c)3+b(c-a)3+c(a-b)3
=a(b-c)3-b[(a-b)+(b-c)]+c(a-b)3
=a(b-c)3-b[(a-b)3+3(a-b)2(b-c)+3(a-b)(b-c)2+(b-c)3]+c(a-b)3
=a(b-c)3-b(a-b)3+3b(a-b)2(b-c)+3b(a-b)(b-c)2+b(b-c)3+c(a-b)3
=(b-c)3(a-b)-(a-b)3(b-c)-3b(a-b)(b-c)(a-b+b-c)
=(b-c)3(a-b)-(a-b)3(b-c)-3b(a-b)(b-c)(a-c)
=(a-b)(b-c)[(b-c)2-(a-b)2-3b(a-c)]
=(a-b)(b-c)[(b-c-a+b)(b-c+a-b)-3b(a-c)]
=(a-b)(b-c)[(2b-a-c)(a-c)-3b(a-c)]
=(a-b)(b-c)(a-c)(2b-a-c-3b)
=-(a-b)(b-c)(a-c)(a+b+c)
=(a-b)(b-c)(c-a)(a+b+c)
c)abc-(ab+ac+bc)+(a+b+c)-1
=abc-ab-ac-bc+a+b+c-1
=abc-bc-ab+b-ac+c+a-1
=bc(a-1)-b(a-1)-c(a-1)+a-1
=(a-1)(bc-b-c+1)
=(a-1)[b(c-1)-(c-1)]
=(a-1)(c-1)(b-1)
=(a-1)(b-1)(c-1)
a3(c - b2) + b(a - c2) + c3(b - a2) + abc(abc - 1)
= a3c - a3b2 + ab3 - b3c2 + c3b - a2c3 + a2b2c2 - abc
= (a2b2c2 - b3c2) + (a3c - abc) - (a3b2 - ab3) - (a2c3 - c3b)
= b2c2(a2 - b) + ac(a2 - b) - ab2(a2 - b) - c3(a2 - b)
= (a2 - b)(b2c2 + ac - ab2 - c3)
= (a2 - b)[(b2c2 - c3) - (ab2 - ac)]
= (a2 - b)[c2(b2 - c) - a(b2 - c)]
= (a2 - b)(c2 - a)(b2 - c)
\(\left(a+b+c\right)\left(ab+bc+ca\right)-abc\)
\(=\left(a+b+c\right)\left(ab+bc\right)+\left(a+b+c\right)ac-abc\)
\(=\left(ab+b^2+bc\right)\left(a+c\right)+\left(a+c\right)ac+abc-abc\)
\(=\left(a+c\right)\left(ab+b^2+bc+ac\right)\)
\(=\left(a+b\right)\left(b+c\right)\left(c+a\right)\)
\(\left(a+b+c\right)\left(ab+bc+ca\right)-abc\)
\(=\left(a+b+c\right)\left(ab+bc\right)+\left(a+b+c\right)ac-abc\)
\(=\left(ab+b^2+bc\right)\left(a+c\right)+\left(a+c\right)ac+abc-abc\)
\(=\left(a+c\right)\left(ab+b^2+bc+ac\right)\)
\(=\left(a+b\right)\left(b+c\right)\left(c+a\right)\)
Sửa:\(\left(a+b\right)\left(b+c\right)\left(c+a\right)+abc\)
\(=\left(ab+ac+b^2+bc\right)\left(c+a\right)+abc\)
\(=abc+a^2b+ac^2+a^2c+b^2c+b^2a+bc^2+abc+abc\)
\(=ab\left(a+b\right)+bc\left(b+c\right)+ac\left(c+a\right)+abc+abc+abc\)
\(=ab\left(a+b+c\right)+bc\left(a+b+c\right)+ac\left(a+b+c\right)\)
\(=\left(a+b+c\right)\left(ab+bc+ca\right)\)