Cách làm cho bạn:
Ta có:
a)$(−4x^{3}−13x^{2}+2x^{5})+(13x^{2}+2x^{3}−12x−1)$
= $−4x^{3}−13x^{2}+2x^{5}+13x^{2}+2x^{3}−12x−1$
$=2x^{5}−2x^{3}−12x−1$
b) $(12x^{6}−11x^{2}+3x^{3}+9)−(13x^{6}+2x^{3}−11x^{2}−11x)$
$= 12x^{6}−11x^{2}+3x^{3}+9−13x^{6}−2x^{3}+11x^{2}+11x$
$=−x^{6}+x^{3}+11x+9$
c) $(8x^{3}−x^{2}+1)(x^{2}−1)$
$=8x^{5}−8x^{3}−x^{4}+x^{2}+x^{2}−1$
$=8x^{5}−8x^{3}−x^{4}+2x^{2}−1$
d) $(8x^{3}+6x^{2}+3x+1):(2x+1)$
$=4x^{2}+x+1$
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