If x and y are both positive and √(x2+y2)=3⋅x−y,thenxy=
A.0
B.14
C.12
D.38
E.1.5
我的答案：
If x and y are both positive and fff\(\sqrt{(x^2+y^2)}=3\cdot x-y,then\frac xy=\)/fff
B.fff\(\frac{1}{4}\)/fff
C.fff\(\frac{1}{2}\)/fff
D.fff\(\frac38\)/fff
(Official1-70可直接使用)
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