2. 外语
  3. A、21/58 B、58/21 C、21 D、42 E、58 DTo divide by a fraction, just flip the top and bottom and multiply. So turns into (3×7)+(7×3),

A、21/58 B、58/21 C、21 D、42 E、58 DTo divide by a fraction, just flip the top and bottom and multiply. So turns into (3×7)+(7×3),

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问题
选项 A、21/58
B、58/21
C、21
D、42
E、58
答案D
解析 To divide by a fraction, just flip the top and bottom and multiply. So turns into (3×7)+(7×3), or 21+21, which gives us 42.
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