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Решите задачу:

$a) \frac{a+b}{a-2b} * \frac{2b-a}{(a-b)(a+b)}= -\frac{a-2b}{(a-2b)(a-b)}=- \frac{1}{a-b}$

$b) \frac{5x-y}{6y-5x}* \frac{-(6y-5x)}{-(5x-y)}= \frac{-1}{-1}=1$

$\frac{(4t-7)^3}{(4t-2)^4} * \frac{(4t-2)^4}{(4t-7) ^{4} }= \frac{1}{4t-7}$

$- \frac{3 k^{2}*p^5 }{8f*l^2*r^3}* \frac{8f^2*l*r}{3k^2*p^3}=- \frac{p^2*f}{l*r ^{2} }$

$\frac{(i+1)^2}{(i-1)^3}* \frac{(i-1)^2}{(i+1)^3}= \frac{1}{(i+1)(i-1)}= \frac{1}{i^2-1}$

$\frac{4l-5k}{j(g+7)}* \frac{-j^2*3(g+7)}{2z(4l-5k)}=- \frac{3j}{2z}$