Помогите))))))))))))

Question

Помогите))))))))))))

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Answer 1

A*b/(а^2-b^2) : a^2*b^2/(a-b) = a*b * (a-b) / (a-b)*(a+b) *a*a*b*b = 
= 1 / (a+b)*a*b

a=5+sqr(5); b=5-sqr(5)

1/ ( ((5+sqr(5)+5-sqr(5)) * (5+sqr(5)) * (5-sqr(5)) ) = 0.1* 1/(5^2-(sqr(5))^2)=
=0.1*1/(25-5)=0.1*1/20=0.1*0.5=0.05