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\(1.25a^2+10a+1\)
\(=\left(5a\right)^2+2.5a.1+1^2\)
\(=\left(5a+1\right)^2\)
\(2.2x^8-12x^4+18\)
\(=2\left(x^8-6x^4+9\right)\)
\(=2\left[\left(x^4\right)^2-2.x^4.3+3^2\right]\)
\(=2\left(x^4-3\right)^2\)
\(=2\left(x^2-\sqrt{3}\right)^2\left(x^2+\sqrt{3}\right)^2\)
\(3.4x+4xy^6+xy^{12}\)
\(=x\left(y^{12}+4y^6+4\right)\)
\(=x\left[\left(y^6\right)^2+2.y^6.2+2^2\right]\)
\(=x\left(y^6+2\right)^2\)
Câu 1
\(25a^2+10a+1\)
\(=\left(5a\right)^2+2\cdot5\cdot a+1\)
\(=\left(5a+1\right)^2\)

a/ \(=2\left(x^8-6x^4+9\right)=2\left(x^4-3\right)^2\)
b/ \(=b\left(a^4+6a^2b^2+9b^4\right)=b\left(a^2+3b^2\right)^2\)
c/ \(=-2\left(a^6+4a^3b+4b^2\right)=-2\left(a^3+2b\right)^2\)
d/ \(=x\left(y^{12}+4y^6+4\right)=x\left(y^6+2\right)^2\)

a,2x^8-12x^4+18=2(x^8-6x^4+9)=2[(x^4)^2-2.x^4.3+3^2] =2(x^4+3)^2 c,=-2(a^6+4a^3b-4b^2)=-2[(a^3)^2+2.a^3.2b-(2b)^2]=-2(a^3-2b)^2 d, 4x+4xy^6+xy^12=x(4+4y^6+y^12)=X[2^2+2.2.y^6+(y^6)^2]=x(2+y^6)^2 Câu b Mình sẽ làm sau nh, trên đây là theo cách giải của mình thui.

a: \(=\dfrac{x^2-x+1-4x}{xy}=\dfrac{x^2-5x+1}{xy}\)
b: \(=\dfrac{5xy^2-x^2y+4xy^2+xy^2}{3xy}\)
\(=\dfrac{10xy^2-x^2y}{3xy}=\dfrac{xy\left(10y-x\right)}{3xy}=\dfrac{10y-x}{3}\)
d: \(\dfrac{2x+4}{10}-\dfrac{2-x}{15}\)
\(=\dfrac{x+2}{5}+\dfrac{x-2}{15}\)
\(=\dfrac{3x+6+x-2}{15}=\dfrac{4x+4}{15}\)
e: \(=\dfrac{x+1}{2\left(x-1\right)}-\dfrac{x^2+3}{2\left(x-1\right)\left(x+1\right)}\)
\(=\dfrac{x^2+2x+1-x^2-3}{2\left(x-1\right)\left(x+1\right)}\)
\(=\dfrac{2\left(x-1\right)}{2\left(x-1\right)\left(x+1\right)}=\dfrac{1}{x+1}\)

a) \(10x^2-29x+10\)
\(=10x^2-4x-25x+10\)
\(=2x\left(5x-2\right)-5\left(5x-2\right)\)
\(=\left(5x-2\right)\left(2x-5\right)\)

Bài 3:
\(x^2-4x+88=x^2-4x+4+84=\left(x-2\right)^2+84>=84\)
=>B<=8/84=2/21
Dấu = xảy ra khi x=2
\(P=x\left(y^{12}+4y^6+4\right)=x\left(y^6+2\right)^2\)
\(P=x\left(y^{12}+4y^6+4\right)\)
\(P=x\left(y^6+2\right)\)
Đáp số : \(P=x\left(y^6+2\right)\)