a) Ta có: \(\left(-5x^4-12x^3-13x^2\right):\left(-2x^2\right)\)
\(=\frac{-x^2\left(5x^2+12x+13\right)}{-2x^2}\)
\(=\frac{5x^2+12x+13}{2}\)
b) Ta có: \(\left(-8x^5+x^3-2x^2\right):2x^2\)
\(=\frac{-x^2\left(8x^3-x+2\right)}{2x^2}\)
\(=\frac{-8x^3+x-2}{2}\)
c) Ta có: \(\left(14x^6-21x^4-35x^2\right):\left(-7x^2\right)\)
\(=\frac{7x^2\left(2x^4-3x^2-5\right)}{-7x^2}\)
\(=-2x^4+3x^2+5\)