若a+b=1 a^2+b^2=2 则b/a+a/b=? thank you!

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若a+b=1a^2+b^2=2则b/a+a/b=?thankyou!若a+b=1a^2+b^2=2则b/a+a/b=?thankyou!若a+b=1a^2+b^2=2则b/a+a/b=?thankyo

若a+b=1 a^2+b^2=2 则b/a+a/b=? thank you!
若a+b=1 a^2+b^2=2 则b/a+a/b=? thank you!

若a+b=1 a^2+b^2=2 则b/a+a/b=? thank you!
(a+b)^2=1 a^2+b^2=2
ab=-1/2
b/a+a/b=(a^2+b^2)/ab=2/(-1/2)=-4