若x+y=6,xy=2.75,x-y>0,求x-y的值
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若x+y=6,xy=2.75,x-y>0,求x-y的值
若x+y=6,xy=2.75,x-y>0,求x-y的值
若x+y=6,xy=2.75,x-y>0,求x-y的值
(x+y)^2=36
x^2+y^2+2xy=36
x^2+y^2=36-2*2.75=30.5
(x-y)^2=x^2+y^2-2xy=30.5-2*2.75=25
x-y=5或者-5
已知x-y>0
x-y=5
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