Bài 1:
= x\(^2\)+3x-x-3
=x\(^2\)+2x-3
Bài 2: dễ mà bạn tự làm nha
Bài 2:
a: \(=\dfrac{\left(x^2-1\right)\left(x^2+1\right)-2x\left(x^2-1\right)}{x^2-1}=x^2+1-2x\)
b: \(=\dfrac{3x^4+3x^2+x^3+x-3x^2-3+5x-5}{x^2+1}\)
\(=3x^2+x-3+\dfrac{5x-5}{x^2+1}\)
c: \(=\dfrac{2x^3-4x^2+3x^2-6x+5x+1}{x^2-2x}\)
\(=2x+3+\dfrac{5x+1}{x^2-2x}\)