设a>b>0,a²+b²-6ab=0,则a+b/b-a的值等于?
2个回答
a²+b²-6ab=0
2a²-4ab+2b²=a²+b²+2ab
2 (a-b)²=(a+b)²
因为a>b>0
所以a+b/b-a=-√2
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