Question

Выполните эти действия плиз!

Answer 1

$1) cfrac{21m^5}{25-10m+m^2}* cfrac{5-m}{7m^4}= cfrac{3m}{(5-m)^2}* cfrac{5-m}{1}= cfrac{3m}{5-m} \ \ \ \ 2) cfrac{3x+6}{x+3} * cfrac{x^2-9}{x^2-4} = cfrac{3(x+2)}{x+3} * cfrac{(x-3)(x+3)}{(x-2)(x+2)} = cfrac{3(x-3)}{x-2} =cfrac{3x-9}{x-2}$