题目已知直角坐标系内有四个点O(0,0)O\left(0,0\right)O(0,0),A(3,0)A\left(3,0\right)A(3,0),B(1,1)B\left(1,1\right)B(1,1),C(x,1)C\left(x,1\right)C(x,1),若以OOO,AAA,BBB,CCC为顶点的四边形是平行四边形,则x=x=x=____.知识点：平行四边形的判定、坐标与图形性质章节：未标注
