Question

нужно упростить ххххххееллп

Answer 1

70) $frac{b ^{2}a-a ^{3} }{ba ^{2} } * frac{b ^{2} a}{b ^{2}-ab } - (b + a)= frac{a(b-a)(b+a)}{ba ^{2} }* frac{b ^{2}a }{b(b-a)} -(b+a)=b+a-b-a$$= 0$
71) $frac{a ^{2}-1 }{a}* frac{a ^{3} }{a-1}* frac{1}{a+1}-a ^{2}= frac{(a-1)(a+1)*a ^{3} }{a(a-1)(a+1)} - a ^{2}= a ^{2} - a ^{2} = 0$

Answer 2

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