簡約 1/2 (0.520+1)+1/2 (0.55+1)

解

簡約

\frac{1}{2} (0.5 \cdot 20 + 1) + \frac{1}{2} (0.5 \cdot 5 + 1)

\frac{29}{4}

十進法表記

7.25

解答ステップ

\frac{1}{2} (0.5 \cdot 20 + 1) + \frac{1}{2} (0.5 \cdot 5 + 1)

0.5 \cdot 20 + 1 = 11

0.5 \cdot 5 + 1 = 3.5

= \frac{1}{2} \cdot 11 + \frac{1}{2} \cdot 3.5

3.5 = \frac{7}{2}

= \frac{1}{2} \cdot 11 + \frac{1}{2} \cdot \frac{7}{2}

\frac{1}{2} \cdot 11 = \frac{11}{2}

\frac{1}{2} \cdot \frac{7}{2} = \frac{7}{4}

= \frac{11}{2} + \frac{7}{4}

\frac{11}{2} + \frac{7}{4} = \frac{29}{4}

= \frac{29}{4}