Question

спостить вираз 20БАЛОВ!!!

Answer 1

$1) \frac{a}{ a^{2}-4 } + \frac{a}{ a^{2} -4a+4} = \frac{a}{(a-2)(a+2)} + \frac{a}{(a-2) ^{2} } = \frac{ a^{2}-2a+ a^{2} +2a }{(a+2)(a-2) ^{2} } = \frac{2 a^{2} }{(a+2)(a-2) ^{2} } \\\\\\2) \frac{2 a^{2} }{(a+2)(a-2) ^{2} }: \frac{2a}{(2-a) ^{2} } = \frac{2 a^{2} }{(a+2)(a-2) ^{2} }* \frac{(2-a) ^{2} }{2a} = \frac{a}{a+2} \\\\\\3) \frac{a}{a+2}- \frac{a}{a+2}=0$