Спростіть вираз: 3/(a-2)-(a+3)/(4-a^2 )+(3a+1)/(a^2-4a+4)
Доведіть тотожність : (3a^3+ab^2-6a^2 b-2b^3)/(9a^5-ab^4-18a^4 b+2b^5 )=1/(3a^2-b^2.)
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