Tính
Giải giúp mik vs ạ
----- Nội dung ảnh -----
3) Tính
a) \( \left( \frac{a+1+\frac{1-2a^2}{a-1}}{\frac{-1}{1-a}} \right) \)
b) \( \left( \frac{a}{b^2-\frac{1}{a}} \right) : \left( \frac{1}{b}+\frac{1}{a} \right) \)
c) \( \left( \frac{4ab}{a+b} \right) \cdot \left( a+\frac{4ab}{a-b} \right) \)
----- Nội dung ảnh -----
3) Tính
a) \( \left( \frac{a+1+\frac{1-2a^2}{a-1}}{\frac{-1}{1-a}} \right) \)
b) \( \left( \frac{a}{b^2-\frac{1}{a}} \right) : \left( \frac{1}{b}+\frac{1}{a} \right) \)
c) \( \left( \frac{4ab}{a+b} \right) \cdot \left( a+\frac{4ab}{a-b} \right) \)