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井邊有容量5公升跟3公升的兩個水桶,664Please respect copyright.PENANAbTBL0Le3SF
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該如何利用這兩個水桶,裝出剛好4公升的水呢?664Please respect copyright.PENANAJXvLyelx9a
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664Please respect copyright.PENANAmbU0cX4XUP
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