Question

Find the Decimal expansion of 129/2^2*5^7​

Answer 1

Since the denominator is not of the form 2m×5n, 2 m × 5 n , and it also has 7 as its factor, the decimal expansion of 12922×57×75 129 2 2 × 5 7 × 7 5 is non-terminating repeating.

Answer 2

Answer :-

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$\frac{129}{ {2}^{2} \times {5}^{7} } \\ = \frac{129}{4 \times 78125} = \frac{129}{312500} = 0.0004128 \\ = 0.00041$

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