已知定义在R上的奇函数f(x)满足f(x-4)=-f(x),且在区间[0,2]上是增函数,若方程f(x)=m(m>0)在区间[-8,8]上有四个不同的根x1,x2,x3,x4,则x1+x2+x3+x4=_____
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![已知定义在R上的奇函数f(x)满足f(x-4)=-f(x),且在区间[0,2]上是增函数,若方程f(x)=m(m>0)在区间[-8,8]上有四个不同的根x1,x2,x3,x4,则x1+x2+x3+x4=_____](/uploads/image/z/1123629-69-9.jpg?t=%E5%B7%B2%E7%9F%A5%E5%AE%9A%E4%B9%89%E5%9C%A8R%E4%B8%8A%E7%9A%84%E5%A5%87%E5%87%BD%E6%95%B0f%28x%29%E6%BB%A1%E8%B6%B3f%28x-4%29%3D-f%28x%29%2C%E4%B8%94%E5%9C%A8%E5%8C%BA%E9%97%B4%5B0%2C2%5D%E4%B8%8A%E6%98%AF%E5%A2%9E%E5%87%BD%E6%95%B0%2C%E8%8B%A5%E6%96%B9%E7%A8%8Bf%28x%29%3Dm%28m%3E0%29%E5%9C%A8%E5%8C%BA%E9%97%B4%5B-8%2C8%5D%E4%B8%8A%E6%9C%89%E5%9B%9B%E4%B8%AA%E4%B8%8D%E5%90%8C%E7%9A%84%E6%A0%B9x1%2Cx2%2Cx3%2Cx4%2C%E5%88%99x1%2Bx2%2Bx3%2Bx4%3D_____)
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