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下车4人又是上车7人车上还有9人，车上原来9几人？学霸也做错了。
下车4人又是上车7人车上还有9人，车上原来9几人？学霸也做错了。
一年级提高题69/83
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App01:27下车4人又是上车7人车上还有9人，车上原来9几人？学霸也做错了。
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