Which of the following fractions has a decimal equivalent that is a terminating decimal ? 如何判断出一个分数是有限小数,
A: 10/189
B:15/196
C:16/225
D:25/144
E:39/128
首先对分数进行分解,将该分数化解到最简单.
然后看分母的结构,例如:含有3或7就肯定是无限小数,含有2或5就肯定是有限小数.
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