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如图所示，我想给vv赋予随机变量xx1的值，但xx1处会报错，试了好多方法都无法解决，想请教下各位老师修改的方向。
如图所示，我想给vv赋予随机变量xx1的值，但xx1处会报错，试了好多方法都无法解决，想请教下各位老师修改的方向。