Rút gọn biểu thức sau: A=\(\left[\left(x^4-x+\frac{x-3}{x^3+1}\right).\frac{\left(x^3-2x^2+2x-1\right)\left(x+1\right)}{x^9+x^7-3x^2-3}+1-\frac{2\left(x+6\right)}{x^2+1}\right].\frac{4x^2+4x+1}{\left(x+4\right)\left(3-x\right)}\)

1.rút gọn biểu thuc P=\(\dfrac{2}{x+3}+\dfrac{1}{x-3}+\dfrac{9-x}{9-x^2}\) với x\(\ne-3vàx\ne3\)

2.thực hiện phép tính \(\left(2x^4-3x^3-3x^2+6x-1\right):\left(x^2-2\right)\)

\(\left(15x^4y^6-12^3y^4-18x^2y^3\right):\left(-6x^2y^2\right)\)

rút gọn biểu thức \(\left(x-3\right)\left(x^2+3x+9\right)-\left(2x-1\right)^2\)

Rút gọn \(B=\left(x^4-x+\frac{x-3}{x^3+1}\times\frac{\left(x^3-2x^2+2x-1\right)\left(x+1\right)}{x^9+x^7-3x^2-3}+1-\frac{2\left(x+6\right)}{x^2+1}\right)\times\frac{4x^2+6x+1}{\left(x+3\right)\left(4-x\right)}\) 

rút gọn

P=\(\left(5x+2\right).\left(2-5x\right)-\left(x-3\right).\left(x^2+3x+9\right)+x\left(x^2+21x\right)-23\)

rút gọn biểu thức 

\(\left(x^2-1\right)\left(x+2\right)-\left(x-4\right)\left(x^2+4x+16\right)\)
làm tính nhân
\(2x\left(3x-2\right)^2\)
\(\left(x-3\right)\left(x^2-3x+9\right)\)

rút gọn các phân thức

a,\(\dfrac{7xy^3\left(x-2y\right)}{14x^2y^2\left(x-2y\right)^2}\)

b,\(\dfrac{4a^2-8ab}{2\left(2b-a\right)^3}\)

c,\(\dfrac{3x^3-3x}{x^4-1}\)

d,\(\dfrac{45x\left(3-x\right)}{15x\left(x-3\right)^3}\)

\(\left(\dfrac{3}{\left(x-3\right)^2}+\dfrac{6}{x^2-9}+\dfrac{x-3}{\left(x+3\right)^2}\right)\left(1:\left(\dfrac{24x^2}{x^4-81}-\dfrac{12}{x^2+9}\right)\right)\)
Nhờ mn giúp mình rút gọn với ạ