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Câu 2 nha
\(a,x^4+2x^3+x^2\)
\(=x^2\left(x^2+2x+1\right)\)
\(=x^2\left(x+1\right)^2\)
\(c,x^2-x+3x^2y+3xy^2+y^3-y\)
\(=\left(x^3+3x^2y+3xy^2+y^3\right)-\left(x+y\right)\)
\(=\left(x+y\right)^3-\left(x+y\right)\)
\(=\left(x+y\right)\left(x^2+2xy+y^2-1\right)\)
a,(x-y)^2-2(x+y)+1 b, x^2-y^2+4x+4 c, 4x^2-y^2+8(y-2)
=(x-y-1)^2 =(x^2+4x+4)-y^2 =4x^2-y^2+8y-16
=(x+2)^2-y^2 =4x^2-(y^2-8y+16)
=(x+2-y)(x+2+y) =4x^2-(y-4)^2
a) (x+y)2-2(x+y)+1=(x+y-1)2
b) x2-y2+4x+4 = (x2+4x+4)-y2=(x+2)2-y2=(x+y+2)(x-y+2)
c)4x2-y2+8(y-2) = 4x2-(y2-8y+16) = (2x)2-(y-4)2=(2x+y-4)(2x-y+4)
d)x3-2x2+2x-4 = x2(x-2)+2(x-2) = (x-2)(x2+2)
e)xy-4+2x-2y=x(y+2) - 2(y+2) = (x-2)(y+2)
1.
a) \(2x\left(x-4\right)+\left(x-1\right)\left(x+2\right)=2x^2-8x+x^2+x-2=x^2-7x-2\)
b) \(\left(x-3\right)^2-\left(x-2\right)\left(x^2+2x+4\right)=x^2-6x+9-x^3+8=-x^3+x^2-6x+17\)
2.
a) \(x^2y+xy^2-3x+3y=xy\left(x+y\right)-3\left(x-y\right)=???\)
b) \(x^3+2x^2y+xy^2-16x=x\left(x^2+2xy+y^2-16\right)=x\left[\left(x+y\right)^2-16\right]=\)làm tiếp chắc dễ
3.
\(\frac{x^4?2x^3+4x^2+2x+3}{x^2+1}\) Giữa x^4 và 2x^3 (vị trí dấu ? là dấu + hay -)
4) \(A=x^2-3x+4=\left(x-\frac{3}{2}\right)^2+\frac{7}{4}\)
\(A\ge\frac{7}{4}\)
Vậy GTNN của A là 7/4
a ) \(16x^4+y^4+4x^2y^2=\left(4x^2\right)^2+8x^2y^2+y^4-4x^2y^2=\left(4x^2+y^2\right)^2-\left(2xy\right)^2=\left(4x^2+y^2-2xy\right)\left(4x^2+y^2+2xy\right)\)
b ) \(x^3-2x-4\)
\(=\left(x^3-8\right)-2x+4\)
\(=\left(x-2\right)\left(x^2+2x+4\right)-2\left(x-2\right)\)
\(=\left(x-2\right)\left(x^2+2x+4-2\right)\)
\(=\left(x-2\right)\left(x^2+2x+2\right)\)
c ) \(x^3+x^2+4\)
\(=\left(x^3+8\right)+\left(x^2-4\right)\)
\(=\left(x+2\right)\left(x^2-2x+4\right)+\left(x+2\right)\left(x-2\right)\)
\(=\left(x+2\right)\left(x^2-2x+4+x-2\right)\)
\(=\left(x+2\right)\left(x^2-x+2\right)\)
a) a2−b2−4a+4
=(a2-4a+4)-b2
=(a-2)2-b2
=(a-2-b)(a-2+b)a2−b2−4a+4
b) x2+2x−3
=x2-x+3x-3
=x(x-1)+3(x-1)
=(x+3)(x-1)x2+2x−3
c) 4x2y2−(x2+y2)2
=(2xy-x2-y2)(2xy+x2+y2)
=-(x-y)2(x+y)2
d) 2a3−54b3
=2(a3-27b3)
=2(a-3b)(a2+3ab+9b2)
\(x^3+4x^2+4x+3\)
\(=x^3+3x^2+x^2+3x+x+3\)
\(=x^2\left(x+3\right)+x\left(x+3\right)+\left(x+3\right)\)
\(=\left(x+3\right)\left(x^2+x+1\right)\)
\(x^2-y^2+4y-4\)
\(=x^2-\left(y^2-4y+4\right)\)
\(=x^2-\left(y-2\right)^2\)
\(=\left(x-y+2\right)\left(x+y-2\right)\)
\(x^4+x^3y-xy^3-y^4\)
\(=x^3\left(x+y\right)-y^3\left(x+y\right)\)
\(=\left(x+y\right)\left(x^3-y^3\right)\)
\(=\left(x+y\right)\left(x-y\right)\left(x^2+xy+y^2\right)\)
Chúc bạn học tốt.
Ý a) sại đề bài ak??
\(16x^4+y^4+4x^2y^2\)
\(=\left(4x^2\right)^2+2.4x^2.y^2+\left(y^2\right)^2-4x^2y^2\)
\(=\left(4x^2+y^2\right)-\left(2xy\right)^2\)
\(=\left(4x^2-2xy+y^2\right)\left(4x^2+2xy+y^2\right)\)
\(x^3-2x-4\)
\(=x^3-2x^2+2x^2-4x+2x-4\)
\(=x^2\left(x-2\right)+2x\left(x-2\right)+2\left(x-2\right)\)
\(=\left(x-2\right)\left(x^2+2x+2\right)\)
\(x^3+x^2+4\)
\(=x^3+2x^2-x^2-2x+2x+4\)
\(=x^2\left(x+2\right)-x\left(x+2\right)+2\left(x+2\right)\)
\(=\left(x+2\right)\left(x^2-x+2\right)\)