Question

помогите с домашкой 7 класс!!

Answer 1

Ответ:

А) 17а^2/26b^2c^3*39b^3c^2/24a^4=17b/16a²c

Б) (4x-y)/4x:(16x^2-y^2)=(4x-y)/4x*1/(4x-y)(4x+y)=1/4x(4x+y)

В) (3m+1)/(3m^2-27n^2)*(3m+9n)/(2+6m)=

=(3m+1)/3(m-3n)(m+3n) * 3(m+3n)/2(1+3m)=1/(m-3n)

Г) (7y-49).(y^2+7y):(y-7)/(y^2+14y+49) =

=7(y-7)/y(y+7) * (y+7)²/(y-7)=7(y+7)/y