another math question

EllenTony · 发表于 2010-6-21 04:30:20

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 answer is E. Thank you!

A. 10/189

B. 15/196

C. 16/225

D. 25/144

E. 39/128 answer is E. Thank you!

canols · 发表于 2010-6-21 09:05:43

对于terminating decimal的题，你就先约到最简，然后看分母有啥因子，要是分母出现3、7、11这样的因子，就是除不尽的，就不是terminating decimal

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 answer is E. Thank you!

A. 10/189

B. 15/196

C. 16/225

D. 25/144

E. 39/128 answer is E. Thank you!

-- by 会员 EllenTony (2010/6/21 4:30:20)

EllenTony · 发表于 2010-6-21 23:00:06

Thanks a lot!

bearwinnie · 发表于 2010-6-22 10:30:21

他懂中文呵

EllenTony · 发表于 2010-6-22 22:01:52

是我当时用的电脑没法输中文，嘻嘻。谢了！

another math question

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