Question

Помогите срочно даю 100 баллов

Answer 1

5)

a)  $\frac{5x}{7y}*\frac{14y}{15x} = \frac{5x*14y}{7y*15x} = \frac{2}{3}$

б)$\frac{a^{2} -ab}{b^{2}+ab }: \frac{3a-3b}{6(a+b)} =\frac{a(a-b)*6(a+b)}{b(b+a)*3(a-b)}=\frac{6a}{3b}=\frac{2a}{b}$

6)

$(\frac{1}{x+1}-\frac{x-2}{x^{2}+2x+1 }) :\frac{12}{(x+1)^{2} } =\frac{(x+1)^{2}-(x-2)(x+1) }{(x+1)^{3} } *\frac{(x+1)^{2} }{12} =\frac{(x+1)^{3} (x+1-x+2)}{12(x+1)^{3} } =\frac{3}{12}=\frac{1}{4}=0.25$