Объяснение:
(16/(b²+8b)) - (2/b)= [16-2(b+8)] / b(b+8) =(16-2b-16)/b(b+8)= -2/(b+8)
((m²-n²)/21m²) : (mn+n²)/14m²)= =(m²-n²)/21m² * 14m²/n(m+n)=
=(m-n)(m+n)*2 / 3n(m+n) = 2(m-n)/3n
Объяснение:
(16/(b²+8b)) - (2/b)= [16-2(b+8)] / b(b+8) =(16-2b-16)/b(b+8)= -2/(b+8)
((m²-n²)/21m²) : (mn+n²)/14m²)= =(m²-n²)/21m² * 14m²/n(m+n)=
=(m-n)(m+n)*2 / 3n(m+n) = 2(m-n)/3n