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I am anxious to solve the math problem in primary school: Xiaoming bought an eraser and sold it in 9 yuan, and then 10 yuan bought it and 1 1 yuan sold it. How much did he earn?
it should be

Xiaoming bought an eraser for 8 yuan and sold it for 9 yuan. He 10 yuan buys, 1 1 yuan sells. How much did he earn?

Earned 9-8= 1 yuan for the first time.

The second time is11-10 =1yuan.

So a * * * earned 1+ 1=2 yuan.

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