[math](1-b/(a+b))(1+b/(a-b))(1-b^2 / a^2)[/math]
[math](a+b-b)/(a+b) \cdot (a-b+b)/(a-b) \cdot (a^2 -b^2)/a^2[/math]
[math]a/(a+b) \cdot a/(a-b) \cdot ((a-b)(a+b))/a^2=1[/math]
semplificando numeratori con denominatori
1' di lettura
4,3
/
5
(3)
![Espressioni letterali: [2a^4-(a^2+b+1)(a^2-b-1)][a^4-(b+1)^2]+(b+1)^4](https://cdn.skuola.net/shared/thumb/159x141/news_foto/2017/10/espr_let_e3.jpg)
