Question

[Pham Trong Bach]

Rút gọn phân thức $\frac{{{\text{(a}}^{\text{4}}-{\text{b}}^{\text{4}}\text{)}}^{\text{3}}}{\text{(b}+{\text{a)(a}}^{\text{2}}+{\text{b}}^{\text{2}}\text{)(a}-{\text{b)}}^{\text{3}}}$  ta được?

A.  $\frac{{\text{(a}}^{\text{2}}+{\text{b}}^{\text{2}}\text{)(a}+\text{b)}}{\text{a}-\text{b}}$

B.  $\frac{{\text{a}}^{\text{2}}+{\text{b}}^{\text{2}}}{\text{a}-\text{b}}$

C.  ${\left(a^2 + b^2\right)}^2{\left(a + b\right)}^2$

D.  $(a^2 + b^2)(a + b)$

Answer 1

[Cao Minh Tâm]