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5. Look at some decimal expressions of fractions such as 3 25 15 20 14 50 2 7 9 16 71 50 91 b carrying out long divisions or using your calculator (Careful, calculators can give mis leading results!), and see which numbers have a terminating decimal expression, whil paying attention to the prime factorisation of the denominator.

5. Look at some decimal expressions of fractions such as 3 25 15 20 14 50 2 7 9 16 71 50 91 b carrying out long divisions or using your calculator (Careful, calculators can give mis leading results!), and see which numbers have a terminating decimal expression, whil paying attention to the prime factorisation of the denominator.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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5. Look at some decimal expressions of fractions such as 325' 5' 15' 20' 14' 50 1 7 9 16 71 50 91 by carrying out long divisions or using your calculator (Careful, calculators can give mis- leading results!), and see which numbers have a terminating decimal expression, while paying attention to the prime factorisation of the denominator. Hint: Take a terminating decimal expression and see what happens when you convert it to a fraction in lowest terms. (Don't include this part in your homework submission.) Now come up with a conjecture for which fractions have a terminating decimal expres- sion. Your conjecture should be of the following form: Let a, b EN with b > 1 and with gcd(a, b) = 1. Then a has a terminating decimal expression iff .... Now prove your conjecture. Note that this is an “if and only if” statement, requiring proofs for both implications.
Transcribed Image Text:5. Look at some decimal expressions of fractions such as 325' 5' 15' 20' 14' 50 1 7 9 16 71 50 91 by carrying out long divisions or using your calculator (Careful, calculators can give mis- leading results!), and see which numbers have a terminating decimal expression, while paying attention to the prime factorisation of the denominator. Hint: Take a terminating decimal expression and see what happens when you convert it to a fraction in lowest terms. (Don't include this part in your homework submission.) Now come up with a conjecture for which fractions have a terminating decimal expres- sion. Your conjecture should be of the following form: Let a, b EN with b > 1 and with gcd(a, b) = 1. Then a has a terminating decimal expression iff .... Now prove your conjecture. Note that this is an “if and only if” statement, requiring proofs for both implications.
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