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\(\frac{2m^2+3m+1}{2m^2-m-1}=\frac{2m^2+2m+m+1}{2m^2-2m+m-1}\)
\(=\frac{2m\left(m+1\right)+\left(m+1\right)}{2m\left(m-1\right)+\left(m-1\right)}=\frac{\left(m+1\right)\left(2m+1\right)}{\left(m-1\right)\left(2m+1\right)}\)
\(=\frac{m+1}{m-1}\)
Bài làm:
1) Ta có: \(2x^2+5xy+2y^2\)
\(=\left(2x^2+4xy\right)+\left(xy+2y^2\right)\)
\(=2x\left(x+2y\right)+y\left(x+2y\right)\)
\(=\left(2x+y\right)\left(x+2y\right)\)
2) Ta có: \(2x^2+2xy-4y^2\)
\(=\left(2x^2-2xy\right)+\left(4xy-4y^2\right)\)
\(=2x\left(x-y\right)+4y\left(x-y\right)\)
\(=2\left(x+2y\right)\left(x-y\right)\)
\(1)2x^2+5xy+2y^2=2x^2+4xy+xy+2y^2=\left(2x^2+4xy\right)+\left(xy+2y^2\right)=2x\left(x+2y\right)+y\left(x+2y\right)=\left(2x+y\right)\left(x+2y\right)\)\(2)2x^2+2xy-4y^2=2x^2+4xy-2xy-4y^2=\left(2x^2-2xy\right)+\left(4xy-4y^2\right)=2x\left(x-y\right)+4y\left(x-y\right)=\left(2x+4y\right)\left(x-y\right)\)
\(2m^2+10m+8\)
\(=2\left(m^2+5m+4\right)\)
\(=2\left(m^2+4m+m+4\right)\)
\(=2\left(m+4\right)\left(m+1\right)\)
=2m2+8m+2m+8
=(2m2+2m)+(8m+8)
=2m(m+1)+8(m+1)
=(m+1)(2m+8)
=(m+1)2(m+4)
=2(m+1)(m+4)
HT~
b) x^8+x^4+1
=x^8-x^2+x^4-x+x^2+x+1
=x^2(x^6-1)+x(x^3-1)+(x^2+x+1)
=x^2[(x^3)^2-1]+x(x^3-1)+(x^2+x+1)
=x^2(x^3-1)(x^3+1)+x(x^3-1)+(x^2+x+1)
=x^2(x-1)(x^2+x+1)(x^3+1)+x(x^3-1)+(x^2+x+1)
=x^2(x-1)(x^2+x+1)(x^3+1)+x(x-1)(x^2+x+1)+(x^2+x+1)
=(x^2+x+1)[x^2(x-1)(x^3+1)+x(x-1)+1]
=(x^2+x+1)(x^6+x^3-x^5-x+1)
dung thi tick cho minh nha minh thu may tinh roi
<=>x4-x+x2 +x+1= x (x-1) (x2+x+1) + (x2+x+1) = (x2+x+1)(x2-x+1)
chắc có lẽ đúng đó
mình chỉ phân tích được đa thức này thôi!
\(x^4+x^2+1\)
\(=x^4+2x^2-x^2+1\)
\(=\left(x^4+2x^2+1\right)-x^2\)
\(=\left(x^2+1\right)^2-x^2\)
\(=\left(x^2+x+1\right)\left(x^2-x+1\right)\)
\(3m^2-2m-1\)
\(=3m^2-3m+m-1\)
\(=3m\left(m-1\right)+\left(m-1\right)\)
\(=\left(m-1\right)\left(3m+1\right)\)
\(3m^2-2m-1\)
\(=3m^2+m-3m-1\)
\(=\left(3m^2+m\right)-\left(3m+1\right)\)
\(=m\left(3m+1\right)-\left(3m+1\right)\)
\(=\left(m-1\right)\left(3m+1\right)\)