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【单选题】
下面说法正确的有( )句。 1、两个不同的质数一定是互质数。 2、互质的两个数没有公因数。 3、最简分数中,分子和分母公因数只有1. 4、约分是依据分数基本性质,把一个分数化成和它大小相等,但分子和分母都比较小的分数。A.
1
B.
2
C.
3
D.
4
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