cho hinh thang ABCD co AB//CD,biet goc A=2lan goc D.tinh cac goc

Tim \(n\in Z\) sao cho:

\(\left(4n^4-3n^2+7n-5\right)⋮\left(n^2+n-1\right)\)

cho bieu thuc:

P=\(\dfrac{x+2}{x+3}-\dfrac{5}{x^2+x-6}+\dfrac{1}{2-x}\)

a)Rut gon P

b)Tim x de P=\(-\dfrac{3}{4}\)

phan tich thanh nhan tu:

\(x\left(y^3-z^3\right)+y\left(z^3-x^3\right)+z\left(x^3-y^3\right)\)

tim n\(\in\)Z:

\(\left(2n^2-n+2\right):\left(2n+1\right)\)

tim a de :

\(\left(2x^3-3x^2+x+a\right):\left(x+2\right)\)

phan tich thanh nhan tu:

\(x^6-2x^4-x^3y^3+2y^3\)

phan tich thanh nhan tu:

\(x^8+14x^4+1\)

phan tich thanh nhan tu:

\(x^{11}+x^{10}+x^9+.....+x^2+x+1\)