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7 questions
6的倒數是?
16\frac{1}{6}61
61\frac{6}{1}16
3
35\frac{3}{5}53
2的倒數是?
12\frac{1}{2}21
1
79\frac{7}{9}97 的倒數是?
79\frac{7}{9}97
97\frac{9}{7}79
17\frac{1}{7}71 x 7 =
7
89
25 × 251=25\ \times\ \frac{25}{1}=25 × 125=
625
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