Question

допоможіть будь ласка!! даю 50 балів!​

Answer 1

Ответ:

Объяснение:

6. (x²-xy)/(x²+y²) ·(x/(x-y) -y/(x+y)=(x(x-y))/(x²+y²) ·(x²+xy-xy+y²)/((x-y)(x+y))=x/(x+y)

7. (m/(m+7) -m/(m-7) -(m²+49)/(49-m²)) ÷(m-7)/(m²+14m+49)=m+7

((m²-7m-m²-7m)/((m+7)(m-7)) +(m²+49)/((m-7)(m+7)))·(m+7)²/(m-7)=m+7

(-14m+m²+49)/((m+7)(m-7)) ·(m+7)²/(m-7)=m+7

(m-7)²/(m-7) ·(m+7)/(m-7)=m+7

m+7=m+7