Question

Помогите решить ! СРочно нужно !!

Answer 1

2. $frac{(x+y)^{2}-(x-y)^{2}}{x^{2} -y^{2} }* frac{x^{2} -y^{2} }{xy} = frac{(x+y-x+y)(x+y+x-y)}{xy}= frac{2x*2y}{xy}=4$

3.$frac{c^{2} }{(c-5)^{2}}* frac{-1(c+5)(c-5)}{5(c+5)}+ frac{c}{c-5}= frac{-c^{2}+5c}{5(c-5)} = frac{-c(c-5)}{5(c-5)}=- frac{c}{5}$

4. ОДЗ: x≠0 и x≠3
$frac{x}{3-x}= frac{6}{x}-1$
$frac{x}{3-x}= frac{6-x}{x}$
x²=18-3x-6x+x² ⇒ 9x=18 ⇒ x=2

Answer 2

Спасибо!!!!