Question

Привидите дроби к данным знаминателям пж помогите

Answer 1

Ответ:

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

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

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

4.$\frac{1}{7x-8y} =\frac{1(-7x-8y)}{(7x-8y)(-7x-8y)}=\frac{-7x-8y}{64y^{2}-49x^{2} }$