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Yuanhe primary school mathematics formula
Solution: 3.7 yuan used 1 pen and 1 notebook.

So 7.4 yuan used two pens and two notebooks.

Four pens and two notebooks to go to 9.8 yuan.

So two pens need 2.4 yuan, one pen needs 1.2 yuan, and one notebook needs 2.5 yuan.

Formula: (9.8-3.7×2)/2= 1.2 (yuan)

3.7- 1.2=2.5 (yuan)

A: (1.2) Each RMB? Every notebook (2.5 yuan)?

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