Задание в пикче)))))))))))))))))

Question

Задание в пикче)))))))))))))))))

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Answer 1

(x+y)/(x-y)+(x-y)/(x+y)=((x+y)^2+(x-y)^2)/((x-y)(x+y))=(x^22xy+y^2+x^2-2xy+y^2)/(x^2-y^2)=(2(x^2+y^2))/(x^2-y^2).
(2(x^2+y^2))/(x^2-y^2)=100
(x^2+y^2)/(x^2-y^2)=50
(x^2-y^2)/(x^2+y^2)=1/50
50+1/50=50+0.02=50.02