4、5题,help me!

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4、5题,helpme!4、5题,helpme! 4、5题,helpme!4.设原来有X千克3X/4+16=4X/5X=320

4、5题,help me!
4、5题,help me!

4、5题,help me!
4.设原来有X千克
3X/4+16=4X/5
X=320

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