Phân tích thành nhân tử:
\(a)ab\left(a-b\right)+bc\left(b-c\right)+ca\left(c-a\right)\\ b)a^2\left(b-c\right)+b^2\left(c-a\right)+c^2\left(a-b\right)\\ c)a^2\left(a+1\right)-b^2\left(b-1\right)+ab-3ab\left(a-b+1\right)\)
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Lời giải:
a)
\(ab(a-b)+bc(b-c)+ca(c-a)=ab(a-b)-bc(c-b)+ca(c-a)\)
\(=ab(a-b)-bc[(a-b)+(c-a)]+ca(c-a)\)
\(=ab(a-b)-bc(a-b)-bc(c-a)+ca(c-a)\)
\(=(a-b)(ab-bc)+(c-a)(ca-bc)\)
\(=(a-b)b(a-c)-(a-c).c(a-b)\)
\(=(a-b)(a-c)(b-c)\)
b)
\(a^2(b-c)+b^2(c-a)+c^2(a-b)\)
\(=a^2(b-c)-b^2[(b-c)+(a-b)]+c^2(a-b)\)
\(=a^2(b-c)-b^2(b-c)-b^2(a-b)+c^2(a-b)\)
\(=(b-c)(a^2-b^2)-(b^2-c^2)(a-b)\)
\(=(b-c)(a-b)(a+b)-(b-c)(b+c)(a-b)\)
\(=(b-c)(a-b)(a+b-b-c)=(b-c)(a-b)(a-c)\)
c)
\(a^2(a+1)-b^2(b-1)+ab-3ab(a-b+1)\)
\(=a^3+a^2-b^3+b^2+ab-3ab(a-b)-3ab\)
\(=(a^3-3a^2b+3ab^2-b^3)+(a^2+b^2+ab-3ab)\)
\(=(a-b)^3+(a-b)^2=(a-b)^2(a-b+1)\)
\(\left(a+b+c\right)\left(ab+bc+ca\right)-abc\)
\(=\left(a+b+c\right)\left(ab+bc\right)+\left(a+b+c\right)ac-abc\)
\(=\left(ab+b^2+bc\right)\left(a+c\right)+\left(a+c\right)ac+abc-abc\)
\(=\left(a+c\right)\left(ab+b^2+bc+ac\right)\)
\(=\left(a+b\right)\left(b+c\right)\left(c+a\right)\)
\(\left(a+b+c\right)\left(ab+bc+ca\right)-abc\)
\(=\left(a+b+c\right)\left(ab+bc\right)+\left(a+b+c\right)ac-abc\)
\(=\left(ab+b^2+bc\right)\left(a+c\right)+\left(a+c\right)ac+abc-abc\)
\(=\left(a+c\right)\left(ab+b^2+bc+ac\right)\)
\(=\left(a+b\right)\left(b+c\right)\left(c+a\right)\)
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)
#)Giải :
a)\(ab\left(b-a\right)+bc\left(b-c\right)+ca\left(c-a\right)\)
\(=a\left(a-b\right)+b^2c-bc^2+ac^2-a^2c\)
\(=ab\left(a-b\right)-\left(a-b\right)\left(a+b\right)c+c^2\left(a-b\right)\)
\(=\left(ab-ac-bc+c^2\right)\left(a-b\right)\)
\(=\left(a-b\right)\left(b-c\right)\left(a-c\right)\)
b) \(a^2\left(b-c\right)-b^2\left(c-a\right)+c^2\left(a-b\right)\)
\(=a^2\left(b-c\right)-b^2\left[\left(b-c\right)+\left(a-b\right)\right]+c^2\left(a-b\right)\)
\(=a^2\left(b-c\right)-b^2\left(b-c\right)-b^2\left(a-b\right)+c^2\left(a-b\right)\)
\(=\left(a^2-b^2\right)\left(b-c\right)-\left(b^2-c^2\right)\left(a-b\right)\)
\(=\left(a-b\right)\left(a+b\right)\left(b-c\right)-\left(b-c\right)\left(b+c\right)\left(a-b\right)\)
\(=\left(a-b\right)\left(b-c\right)\left(a-c\right)\)