设函数y=f(x)对任意非零实数x1,x2满足f(x1x2)=f(x1)+f(x2)(1)证明f(1)=f(-1)=0(2)证明f(x)是偶函数(3)已知f(x)为(0,+无穷)上的增函数,且满足f(x)+f(x-1\2)≤0,求x

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