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井邊有容量5公升跟3公升的兩個水桶,700Please respect copyright.PENANAoYX6FpWsC2
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該如何利用這兩個水桶,裝出剛好4公升的水呢?700Please respect copyright.PENANAe5HfYi2hub
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700Please respect copyright.PENANAKdDMPdxmy5
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