簡約 (20-40(5))/(5^2)+1/2

解

簡約

\frac{20 - 40 ( 5 )}{5 ^{2}} + \frac{1}{2}

- \frac{67}{10}

十進法表記

- 6.7

解答ステップ

\frac{20 - 40 ( 5 )}{5 ^{2}} + \frac{1}{2}

規則を適用する:

(a) = a

(5) = 5

= \frac{20 - 40 \cdot 5}{5 ^{2}} + \frac{1}{2}

\frac{20 - 40 \cdot 5}{5 ^{2}} = - \frac{180}{25}

= - \frac{180}{25} + \frac{1}{2}

- \frac{180}{25} + \frac{1}{2} = - \frac{67}{10}

= - \frac{67}{10}