f(x)+f(y)=f(xy) f(2)=1证f(8)=3f(x)是定义在(o,正无穷)上的 增函数
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f(x+y)=f(x)+f(y)+2xy
f(x+y)+f(xy-1)=f(x)f(y)+2f(n)表达式
f(xy)=f(x)+f(y),证明f(x/y)=f(x)-f(y)
f(xy)=f(x)+f(y),f(2)=1,f(3)=?
f(xy)=f(x)+f(y)且f(8)=3则f(2)=
f(xy)=f(x)+f(y),f(8)=3,则f(根2)等于
f(xy)=f(x)+f(y),f(8)=3,求f(√2),
已知f(x+y)=f(x)+f(y)+2xy,求f(0)
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f(xy)=f(x)+f(y)的单调性
任意正实数成立f(xy)=f(x)+f(y),f(2)
f(xy)=f(x)+f(y),证明f(1/x)=-f(x)
f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y
函数fx满足关系f(xy)=f(x)+f(y) 求f(1/3)+f(1/2)+f(1)+f(2)+f(3)
已知f(xy)=f(x)+f(y),求证f(x/y)=f(x)-f(y)