一个分数的分子缩小3倍，分母扩大3倍，分数值就缩小请选择DCBA;P*{7v9Y:?2o9w2K倍。7W9R8P8E9l3M4H1I
A．37W9R8P8E9l3M4H1I
B．67W9R8P8E9l3M4H1I
C．97W9R8P8E9l3M4H1I
D．不变7W9R8P8E9l3M4H1I