已知⊙C与两平行直线x-y=0及x-y-4=0都相切,且圆心C在直线x+y=0上, (Ⅰ)求⊙C的方程; (Ⅱ)斜率为2的直线l与⊙C相交于A,B两点,O为坐标原点且满足 OA ⊥ OB ,求直线l的方程.
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