Помогите порешать 1 2 1 --------- - -------------- + ----------------- =? (2m-5n)² 25n² - 4m² (5n + 2m)² a²+24a-5 a - --------------=? a²-5
1)((5n+2m)²-2(25n²-4m²)+(5n-2m)²)/(25n²-4m²)²= =(5n+2m-5n+2m)²/(25n²-4m²)²=16m²/(25n²-4m²)² 2)(a(a²-5)-(a²+24a-5)/(a²-5)=(a³-5a-a²+24a+5)/(a²-5)=(a³-a²+19a+5)/(a²-5)