Question

спостить вираз 20БАЛОВ!!!

Answer 1

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