Question

алгебра 8 класс ...........................................................................

Answer 1

Ответ:

Объяснение:

1)  49/(7-m)-m²/(7-m)=(49-m²)/(7-m)=(7-m)(7+m)/(7-m)=7+m;

2)  (x+7)/(x²-1)-6/(x²-1)=(x+7-6)/(x²-1)=(x+1)/(x-1)(x+1)=1/(x-1);

3)  (5x-2)(x²-y²) -(5y-2)/(x²-y²) = (5x-2-5y+2)/(x²-y²)=5(x-y)/(x-y)(x+y)=

=5/(x+y);

4)  (3a-4b)/(a-b)² + (2a-b)/(a-b)² = (3a-4b+2a-b)/(a-b)²=(5a-5b)/(a-b)²=

=5(a-b)/(a-b)(a-b)=5/(a-b).