a: \(\dfrac{3x-2}{2x^2+7}=\dfrac{\left(3x-2\right)\left(x+1\right)}{\left(2x^2+7\right)\left(x+1\right)}=\dfrac{3x^2+x-2}{\left(2x^2+7\right)\left(x+1\right)}\)
b:
Sửa đề: Đathức cho trước là x^3-x+5x^2-5
\(\dfrac{\left(x^2+7x+10\right)\left(x-1\right)}{\left(x^2+3x+2\right)}\)
\(=\dfrac{\left(x+5\right)\left(x+2\right)\left(x-1\right)}{\left(x+2\right)\left(x+1\right)}=\dfrac{\left(x+5\right)\left(x-1\right)}{\left(x+1\right)}\)
\(=\dfrac{\left(x+5\right)\left(x-1\right)\left(x+1\right)}{\left(x+1\right)^2}=\dfrac{x^3+5x^2-x-5}{\left(x+1\right)^2}\)