Verified answer

Объяснение:

4) (6x²-3x)/(4-8x) = 3x(2x-1)/4(1-2x) = -3x(2x-1)/4(2x-1) = -3x/4

5) (m²-16)/(m²+8m+16) = (m-4)(m+4)/m+4)² = (m-4)/(m+4)

6) (b⁵-b³)/(b²-b⁴) = b³(b²-1)/b²(1-b²) = -b³(b²-1)/(b²-1) = -b³