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四年级奥数-苹果质量增加到原来的3倍，连箱重19千克，求苹果质量
苹果重多少千克
四年级思维训练题3/17
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App02:30打开App观看
苹果重多少千克
App03:20App02:52App01:43App01:38App02:56App01:24App02:18App01:54App02:15App01:17App01:03App01:41App01:21App01:58App01:42App02:13App02:30
