与えられた分数を約分する問題です。

1. 問題の内容

与えられた分数を約分する問題です。

2. 解き方の手順

各分数を約分します。

(15) $\frac{17}{34} = \frac{17 \div 17}{34 \div 17} = \frac{1}{2}$

(16) $\frac{17}{51} = \frac{17 \div 17}{51 \div 17} = \frac{1}{3}$

(17) $\frac{34}{51} = \frac{17 \times 2}{17 \times 3} = \frac{2}{3}$

(18) $\frac{17}{68} = \frac{17 \div 17}{68 \div 17} = \frac{1}{4}$

(19) $\frac{34}{68} = \frac{34 \div 34}{68 \div 34} = \frac{1}{2}$

(20) $\frac{51}{68} = \frac{17 \times 3}{17 \times 4} = \frac{3}{4}$

(21) $\frac{17}{85} = \frac{17 \div 17}{85 \div 17} = \frac{1}{5}$

(22) $\frac{30}{40} = \frac{30 \div 10}{40 \div 10} = \frac{3}{4}$

(23) $\frac{28}{42} = \frac{14 \times 2}{14 \times 3} = \frac{2}{3}$

(24) $\frac{12}{60} = \frac{12 \div 12}{60 \div 12} = \frac{1}{5}$

(25) $\frac{22}{66} = \frac{22 \div 22}{66 \div 22} = \frac{1}{3}$

(26) $\frac{30}{75} = \frac{15 \times 2}{15 \times 5} = \frac{2}{5}$

(27) $\frac{34}{85} = \frac{17 \times 2}{17 \times 5} = \frac{2}{5}$

(28) $\frac{51}{85} = \frac{17 \times 3}{17 \times 5} = \frac{3}{5}$

3. 最終的な答え

(15) $\frac{1}{2}$

(16) $\frac{1}{3}$

(17) $\frac{2}{3}$

(18) $\frac{1}{4}$

(19) $\frac{1}{2}$

(20) $\frac{3}{4}$

(21) $\frac{1}{5}$

(22) $\frac{3}{4}$

(23) $\frac{2}{3}$

(24) $\frac{1}{5}$

(25) $\frac{1}{3}$

(26) $\frac{2}{5}$

(27) $\frac{2}{5}$

(28) $\frac{3}{5}$