Question

ПРИВЕДИТЕ ДРОБИ К ДАННЫМ ЗНАМЕНАТЕЛЯМ 8 КЛАСС КАРТИНКА ПРИКРЕПЛЕНА

Answer 1

1.

$\frac{3a}{3(a-4)} =\frac{3a}{3a-12}$

2.

$25n^{2}-15mn=5n(5n-3m)=-5n(3m-5n)\\\\\frac{-5mn}{(3m-5n)(-5n)} =\frac{-5mn}{25n^{2}-15mn}$

3.

$x^{2}-2x+1=(x-1)^{2}\\\\\frac{2x}{x-1} =\frac{2x(x-1)}{(x-1)^{2}} =\frac{2x^{2}-2x}{x^{2}-2x+1}$

4.

$64y^{2}-49x^{2}=(8y-7x)(8y+7x)=-(7x-8y)(8y+7x)=(7x-8y)(-7x-8y)$

$\frac{-7x-8y}{(7x-8y)(-7x-8y)} =\frac{-7x-8y}{64y^{2}-49x^{2}}$