给出下列说法：①分式方程28-x=0无解；②方程|x|x2+1=0无解；③方程x+1x+1=1x+1-1的解是x=-1；④x-2x2-4=0的解是x=2．其中，正确说法的个数为（）A．1B．2C．3D

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