数学题树状图做？ 数学8，9题树状图法
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\u5219\u5404\u81ea\u7684\u80dc\u7387\u90fd\u662f3/9=1/3
9.\u56e0\u4e3a\u662f\u4e0a\u4e2d\u4e0b\u5404\u81ea\u5206\u5c42\u5404\u81ea\u62bd\u4e00\u5f20\uff0c\u6240\u4ee5\u5206\u4e09\u5c42\uff0c\u6bcf\u5c42\u4e09\u79cd\u53ef\u80fd\uff0c\u5982\u56fe\uff1a
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见下图
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