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\(x^2-y^2+4x+4\)
\(=\left(x+2\right)^2-y^2\)
\(=\left(x+2+y\right)\left(x+2-y\right)\)
\(4x^2-y^2+8\left(y-2\right)\)
\(=4x^2-\left(y^2-8y+16\right)\)
\(=4x^2-\left(y-4\right)^2\)
\(=\left(2x+y-4\right)\left(2x-y+4\right)\)
A=(ab^2-cb^2)+(ca^2-ac^2)+(bc^2-ba^2)
A=b^2(a-c)+ac(a-c)-b(a-c)(a+c)
A=(a-c)(b^2+ac-ab-bc)
A=(a-c)((b^2-bc)-(ab-ac))
A=(a-b)(b-c)(c-a)
A=(ab^2-cb^2)+(ca^2-ac^2)+(bc^2-ba^2)
A=b^2(a-c)+ac(a-c)-b(a-c)(a+c)
A=(a-c)(b^2+ac-ab-bc)
A=(a-c)((b^2-bc)-(ab-ac))
A=(a-b)(b-c)(c-a)
\(\left(a+b\right)\left(a^2-b^2\right)+\left(b+c\right)\left(b^2-c^2\right)+\left(c+a\right)\left(c^2-a^2\right)\)
\(=\left(a+b\right)\left(a^2-b^2\right)-\left(b+c\right)\left(a^2-b^2\right)-\left(b+c\right)\left(c^2-a^2\right)+\left(a+c\right)\left(c^2-a^2\right)\)
\(=\left(a^2-b^2\right)\left(a+b-b-c\right)-\left(c^2-a^2\right)\left(b+c-c-a\right)\)
\(=\left(a-b\right)\left(a+b\right)\left(a-c\right)-\left(c-a\right)\left(c+a\right)\left(b-a\right)\)
\(=\left(a-b\right)\left(a-c\right)\left(a+b-c-a\right)\)
\(=\left(a-b\right)\left(a-c\right)\left(b-c\right)\)
\(a\left(b-c\right)^2+b\left(c-a\right)^2+c\left(a-b\right)^2+8abc\)
\(=a\left(b^2-2bc+c^2\right)+b\left(c^2-2ac+a^2\right)+c\left(a^2-2ab+b^2\right)+8abc\)
\(=ab^2-2abc+ac^2+bc^2-2abc+ba^2+ca^2-2abc+cb^2+8abc\)
\(=ab^2+ac^2+bc^2+ba^2+ca^2+cb^2+2abc\)
\(=\left(ac^2+bc^2\right)+\left(ab^2+ba^2\right)+\left(ca^2+cb^2+2abc\right)\)
\(=c^2\left(a+b\right)+ab\left(a+b\right)+c\left(a^2+b^2+2ab\right)\)
\(=c^2\left(a+b\right)+ab\left(a+b\right)+c\left(a+b\right)^2\)
\(=\left(a+b\right)\left[c^2+ab+c\left(a+b\right)\right]=\left(a+b\right)\left(c^2+ab+ca+bc\right)\)
\(=\left(a+b\right)\left[\left(c^2+ca\right)+\left(ab+bc\right)\right]=\left(a+b\right)\left[c\left(c+a\right)+b\left(a+c\right)\right]\)
\(=\left(a+b\right)\left(b+c\right)\left(c+a\right)\)
1/ phân tích thành nhân tử ;
= C2-( a +b )2=( c-a -b ) . ( c+a +b )
-c2(a - b) + b2(a - c) - a2(b - c)
= -c2a + c2b + b2a - b2c - a2b + a2c
= (a2c - c2a + c2b - b2c) + (b2a - a2b)
= c(a2 - ac + bc - b2) + ab(b - a)
= c2[(a - b)(a + b) - c(a - b)] - ab(a - b)
= c2(a - b)(a + b - c) - ab(a - b)
= (a - b)(c2a + c2b - c3 - ab)
cảm ơn bạn