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People's Education Press Primary School Grade One Volume II Mathematics RMB Unit Knowledge
It is easier to convert to the same unit, as follows-

Solution: I am used to solving problems. I don't know if I should write "Xie" in primary school now.

9 yuan 2 jiao =9.2 yuan.

10-9.2=0.8 yuan

A: 0.8 yuan should be returned to Xiaoming.

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