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Bài 1 :
\(x^2-6x+8=x^2-2x-4x+8=x\left(x-2\right)-4\left(x-2\right)=\left(x-4\right)\left(x-2\right)\)
Bài 2 :
\(x^8+x^7+1=x^8+x^7+x^6+x^5+x^4+x^3+x^2+x+1-x^6-x^5-x^4-x^3-x^2-x\)
\(=x^6\left(x^2+x+1\right)+x^3\left(x^2+x+1\right)+x^2+x+1-x^4\left(x^2+x+1\right)-x\left(x^2+x+1\right)\)
=\(\left(x^2+x+1\right)\left(x^6+x^3+1-x^4-x\right)\)
Tick đúng nha
\(1,\\ a,=4\left(x-2\right)^2+y\left(x-2\right)=\left(4x-8+y\right)\left(x-2\right)\\ b,=3a^2\left(x-y\right)+ab\left(x-y\right)=a\left(3a+b\right)\left(x-y\right)\\ 2,\\ a,=\left(x-y\right)\left[x\left(x-y\right)^2-y-y^2\right]\\ =\left(x-y\right)\left(x^3-2x^2y+xy^2-y-y^2\right)\\ b,=2ax^2\left(x+3\right)+6a\left(x+3\right)\\ =2a\left(x^2+3\right)\left(x+3\right)\\ 3,\\ a,=xy\left(x-y\right)-3\left(x-y\right)=\left(xy-3\right)\left(x-y\right)\\ b,Sửa:3ax^2+3bx^2+ax+bx+5a+5b\\ =3x^2\left(a+b\right)+x\left(a+b\right)+5\left(a+b\right)\\ =\left(3x^2+x+5\right)\left(a+b\right)\\ 4,\\ A=\left(b+3\right)\left(a-b\right)\\ A=\left(1997+3\right)\left(2003-1997\right)=2000\cdot6=12000\\ 5,\\ a,\Leftrightarrow\left(x-2017\right)\left(8x-2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=2017\\x=\dfrac{1}{4}\end{matrix}\right.\\ b,\Leftrightarrow\left(x-1\right)\left(x^2-16\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=4\\x=-4\end{matrix}\right.\)
\(x\left(x+1\right)\left(x+2\right)\left(x+3\right)+1\)
\(=\left[x\left(x+3\right)\right]\left[\left(x+1\right)\left(x+2\right)\right]+1\)
\(=\left(x^2+3x\right)\left(x^2+3x+2\right)+1\)
Đặt \(x^2+3x=t\) ta có :
\(\left(x^2+3x\right)\left(x^2+3x+2\right)+1=t\left(t+2\right)+1=t^2+2t+1=\left(t+1\right)^2\)
\(=\left(x^2+3x+1\right)^2\)
Vậy \(x\left(x+1\right)\left(x+2\right)\left(x+3\right)+1\) phân tích thành nhân tử là \(\left(x^2+3x+1\right)^2\)
= (x4 + 2x2 + 1) + (2x4 + x2 + 2) - (x2 + x+1)2
= [(x2 + 1)2 - (x2 + x+1)2 ] + (2x4 + x2 + 2)
= (x2 + 1 + x2 + x + 1). (x2 + 1 - x2 - x- 1) + (2x4 + x2 + 2)
= (2x2 + x + 2) (-x) + (2x4 + x2 + 2) = -2x3 - x2 - 2x + 2x4 + x2 + 2 = -2x3 + 2x4 - 2x + 2
= -2x3. (1 - x) + 2.(1 - x) = (1- x). (-2x3 + 2) = 2.(1 - x)(1- x3) = 2. (1- x). (1- x) .(1 + x + x2) = 2.(1-x)2. (1 + x + x2)
(x-1).(2x+1) + 3.(x-1).(x+2).(2x+1)
= (x-1).(2x+1).[1+3.(x+2)]
chúc bn học tốt
(x-1).(2x+1) + 3.(x-1).(x+2).(2x+1)
= (x-1).(2x+1).[1+3.(x+2)]
#
\(A=\left(x-1\right)\left(x-2\right)\left(x-3\right)+\left(x-1\right)\left(x-2\right)-\left(x-1\right)\)
\(A=\left(x-1\right)\left(x^2-5x+6\right)+\left(x-1\right)\left(x-2\right)-\left(x-1\right)\)
\(A=\left(x-1\right)\left(x^2-5x+6\right)+\left(x-1\right)\left(x-2\right)-\left(x-1\right)\)\(A=\left(x-1\right)\left(x^2-5x+6+x-2\right)-\left(x-1\right)\)
\(A=\left(x-1\right)\left(x^2-4x+4\right)-\left(x-1\right)\)
\(A=\left(x-1\right)\left(x-2\right)^2-\left(x-1\right)\)
\(A=\left(x-1\right)\left[\left(x-2\right)^2-1\right]\)
\(A=\left(x-3\right)\left(x-1\right)^2\)
link tham khảo
https://olm.vn/hoi-dap/detail/9212510579.html
hok tót
(x-1)(x-2)(x-3)(x-4)+1=(x-1)(x-4)(x-2)(x-3)+1
=(x2 -5x+4)(x2 -5x+6)+1
=(x2 -5x+4)2 +2(x2 -5x+4)+1
=(x2 -5x+4+1)2
=