原式等于x/y+x/z+y/x+y/z+z/x+z/y+x/x+y/y+z/z等于0则1/x(x+y+z)+1/y(x+y+z)+1/z(x+y+z)等于0则(x+y+z)(1/x+1/y+1/z)等于0,根据已知得x+y+z等于0
已知x(1/y+1/z)+y(1/x+1/z)+z(1/x+1/y)+3=0,且1/x+1/y+1/z不等于0,求x+y
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x(1/y+1/z)+y(1/x+1/z)+z(1/x+1/y)+3=0,且1/x+1/y+1/z不等于0,求x+y+z
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(1)已知:x(1/y+1/z)+y(1/x+1/z)+z(1/x+1/y)+3=0,且1/x+1/y+1/z不等于0,
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