gwd 26-8

Q8:

Which of the following fractions has a decimal equivalent that is a terminating decimal?
A. 10/189
B. 15/196
C. 16/225
D. 25/144
E. 39/128

Rank: 4

2^#

missouyang发表于 2006-5-30 20:50 | 只看该作者

A: 189 = 3^4 * 7
B: 196 = 2^4 * 11
C: 225 = 5^2 * 3^2
D: 144 = 3^2 * 2^4
E: 128 = 2^7

39/128 = 39 * (0.5)^7 (limited number of decimal numbers)

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