Question

помогите, пожалуйста 28

Answer 1

1)1+2∛a²-(a+∛a²)/(1+∛a)=1+2∛a²-∛a²(∛a+1)/(1+∛a)=1+2∛a²-∛a²=1+∛a²
2)(1-a∛a)/(1-∛a²)=(1-∛a²)(1+∛a²)/(1-∛a²)=1+∛a²
3)(1+∛a²):(1+∛a²)=1