b/a+a/b=3,求2ab/(a*a+b*b)-(3a*a+ab+3b*b)/2ab的值
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b/a+a/b=3,求2ab/(a*a+b*b)-(3a*a+ab+3b*b)/2ab的值
b/a+a/b=3,求2ab/(a*a+b*b)-(3a*a+ab+3b*b)/2ab的值
b/a+a/b=3,求2ab/(a*a+b*b)-(3a*a+ab+3b*b)/2ab的值
因为b/a+a/b=3
所以a²+b²=3ab
那么 2ab/(a*a+b*b)-(3a*a+ab+3b*b)/2ab
=2ab/3ab-(9ab+ab)/2ab
=-13/3
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