Question

Хотя бы ответы. Даю14 балов

Answer 1

912.
a)   ..........=$frac{x(x-4)}{x(x+7)} * frac{(7-x)(7+x)}{6((4-x)} = frac{-(7-x)}{6} = frac{x-7}{6} \ \ b) .....= frac{y(y^{2}-16) }{2(y+9)}* frac{y(y+9)}{4-y}= frac{ -y^{2} (4-y)(y+4)}{2(4-y)}= frac{-y^{3}-4y }{2}$

в)   ..........=b/4a

г)   ..........=$frac{5(c-1)( c^{2}+c+1) }{c+2}* frac{13(c+2)}{c^{2}+ c+1}=65(c- 1)$