помогите пж 30 баллов

5) (а³-25а)(1/а+5 - 1/а-5)=(10³-25×10)(1/10+5 - 1/10-5)=(1000-250)(1/15 - 1/5)= 750(1/15 - 3/15) = 750 × (- 2/15) = - 100/1= -100
6) m+n/4m(m-n) - m-n/4m(m+n) = 2+(-3)/4×2×(2-(-3)) - 2-(-3)/4×2×(2+(-3)) = (-1)/40 - 5/(-8) = ...