Problems from Types of decimal numbers

Define an exact decimal number $$a$$, a pure periodic decimal number $$b$$ and a ultimately periodic decimal number $$c$$.

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Development:

$$a=2,654$$

$$b=13,\widehat{187}$$

$$c=19,13\widehat{76}$$

Solution:

$$a=2,654$$

$$b=13,\widehat{187}$$

$$c=19,13\widehat{76}$$

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