解:因为a/x+b/y=1x+y=(a/x+b/y)*(x+y)=a+b+ay/x+bx/y=10+ay/灶差盯x+bx/庆蔽y(a/x+b/y)*(x+y)≥1*18=1810+ay/x+bx/y≥18,ay/x+bx/y≥8ay/x+bx/y≥2√(ay/x*bx/y)=2√隐和ab2√ab=8,ab=16a+b=10a所以a=2,b=8
x+y>2倍的(xy的平方根),可得xy<=81,后来我让x=9,y=9,试数燃喊出了a=1,b=9或段悔b=1,a=9,蒙得!薯野