разложите на множители:
1. 5mn+15m-10n-30 2. 256-b⁴

1) 5mn+15m-10n-30= 5·(mn+3m-2n-6)= 5·(m·(n+3)-2·(n+3))= 5·(n+3)·(m-2)

2) 256-b^4= (16-b²)·(16+b²)= (4-b)·(4+b)·(16+b²)