1/a+1/b=5/(a+b),则b/a+a/b的值为

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1/a+1/b=5/(a+b),则b/a+a/b的值为1/a+1/b=5/(a+b),则b/a+a/b的值为1/a+1/b=5/(a+b),则b/a+a/b的值为1/a+1/b=(a+b)/ab=5/

1/a+1/b=5/(a+b),则b/a+a/b的值为
1/a+1/b=5/(a+b),则b/a+a/b的值为

1/a+1/b=5/(a+b),则b/a+a/b的值为
1/a+1/b
=(a+b)/ab
=5/(a+b)
所以(a+b)^2=5ab
a^2+b^2=3ab
b/a+a/b
=(a^2+b^2)/ab
=3ab/ab
=3

1/a+1/b=5/(a+b）
所以（a+b)^2/ab=5
b/a+a/b=(a+b)^2/ab -2=5-2=3