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Verified answer

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ВикаВикторовна

Verified answer

А) = (2b(b+2a)+a(a-4b))/36a²b² = (2b²+4ab+a²-4ab)/36a²b² = (2b²+a²)/36a²b² 
б) = ((a-b)(a+b)+b²)/(a+b) = (a²-b²+b²)/(a+b) = a²/(a+b) 
в) = (х-1)/(х-у) + (х+2)/(х-у) - (х+1)/(х-у) = (х-1+х+2-х-1)/(х-у) = х/(х-у) 
г) = ((а-4)(а+2)-а(а-2))/(а(а+2)) = (а²+2а-4а-8-а²+2а)/(а²+2а) = - 8/(а²+2а)