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How much is a notebook cheaper than a pencil case? Please ask a math question and answer it.
(1)4.2-2.4= 1.8 (yuan)

A: Notebooks are cheaper than pencil cases 1.8 yuan.

(2) Question: Xiao Ming brought 10 yuan. Are these three kinds of stationery enough?

4.2+0.5+2.4=7. 1 (yuan)

7. 1 & lt； 10

Answer: 10 yuan is enough.

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