2. 外语
  3. 1/3 + 3/7=______

1/3 + 3/7=______

admin2013-02-19  11
问题 1/3 + 3/7=______
选项
答案16/21
解析 You must first find the Lowest Common Denominator(LCD)for the two fractions involved. The denominators are 3 and 7. The smallest number into which both of these numbers can divide evenly is 21. Convert each denominator to 21 by multiplying 1/3 by 7/7 and 3/7 by 3/3. This gives you 7/21+9/21, which equals 16/21.
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